Studio Technologies 58 User Manual

Download

for Surround

Model 58 Central Controller and

Model 59 Control Console

User Guide

Issue 2, April 1998

This User Guide is applicable for serial numbers:

Model 58 M58-00151 and later Model 59 M59-00151 and later

5520 West Touhy Avenue

Skokie, Illinois 60077 U.S.A.

Telephone (847) 676-9177

Fax (847) 982-0747

www.studio-tech.com

50079-498, Issue 2

for Surround

Tab le of Contents

Foreword..................................................................... 5

Introduction ................................................................. 7

What This User Guide Covers ................................ 7

StudioComm for Surround ...................................... 7

Model 58 Central Controller .................................... 7

Model 59 Control Console....................................... 8

Applications................................................................. 11

Installation................................................................... 15

Configuration............................................................... 21

Operation .................................................................... 37

Technical Notes .......................................................... 40

Specifications .............................................................. 42

Appendix A

Controlling the Model 58 ......................................... 4 3

MIDI Messages ....................................................... 44

Appendix B

Model 58 Single-Channel Mode.............................. 5 2

Appendix C

Block Diagrams

Model 58 Central Controller

Model 59 Control Console

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Forew ord

Simply stated: I had a blast working on the StudioComm for Surround components! It is very rewarding to develop a set of products for a market that’s actually receptive to new ideas and supportive of innovation.

A big thanks to Jeff Levison, formerly of Warner Hollywood Studios. He patiently answered our questions over a period of many months, helping to guide us in the right direction. I recently read an interesting book on the history of the Warner Brothers and their movie empire. One of the things that stood out was their long-term commitment to audio. From the Jazz Singer to the current DVD releases, they haven’t been afraid of staying on the forefront of sound for picture. Good going guys!

Mitch Budniak designed much of the hardware and kept us out of “digital trouble.” Carrie Loving provided engineering support and designed the product graphics. Larry Leviton wrote the excellent software that makes the hardware “come to life.” Fred Roeck performed the mechanical design. Al “PCB PRO” Lux designed the...you guessed it! Joe Urbanczyk coordinated the safety testing and created the automated test routes for our Audio Precision System Ones.

Our plans are to continue with other StudioComm for Surround components. Your praise, comments, or complaints are encouraged, helping to keep us going in the right direction. Please contact me via E-mail at gkapes@studio-tech.com.

Sincerely,

Gordon K. Kapes President

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Introduction

What This User Guide Covers

This User Guide is designed to assist you when installing and using the Model 58 Central Controller and the Model 59 Control Console. A limited amount of troubleshooting information is also provided. Should you require detailed technical information please refer to the Service Guide covering the Models 58 and 59. The Service Guide contains detailed service information, including schematic diagrams. The Service Guide is not shipped with each StudioComm for Surround system, but is available from the factory upon request. It is free of charge to purchasers of StudioComm for Surround equipment. Call, send a fax, or E-mail us if you need this highly exciting document!

location. Using a single 9-pin cable, a Model 59 connects to up to four Model 58 Central Controllers. Each Model 58 supports four 2-channel inputs and two output channels in a single rack space. By selecting two, three, or four Model 58s, 4-, 6-, or 8-channel systems can be created.

The Models 58 and 59 were developed in conjunction with experts in the post-production audio field. The overall goal turned out to be very straightforward: provide the necessary technical performance and features, while keeping it simple to operate! Be certain that users won’t have to go through a long “learning curve” before they become efficient. Allow the StudioComm for Surround system to be flexible, but not so much as to hinder the “big picture.” The end result achieves these goals, providing extensive capability in a simple-to-operate format.

StudioComm for Surround

As the production of multi-channel “surround sound” audio material becomes more prevalent, the need for monitoring these sources becomes imperative for more and more facilities. Whether it’s 4-, 6-, or 8-channel formats, a means to select input sources, insert support devices into the audio path, and control the output level to monitor loudspeakers is required. Studio Technologies has addressed this need with the StudioComm for Surround Model 58 Central Controller and Model 59 Control Console. Using these components a system can be configured to meet a facility’s exact monitoring requirements.

A StudioComm for Surround system starts with a Model 59 Control Console, a compact but comfortable “command center,” that is designed to reside at the operator’s

Model 58 Central Controller

The Model 58 Central Controller is a single rack-space unit that supports two output channels. Multiple Model 58s are connected together to achieve 4-, 6-, or 8channel systems. Each Model 58 provides eight inputs, organized as four 2-channel pairs. Two 2-channel insert sections allow connection to external processing equipment, specifically surround-sound encoder-decoder units. The insert sections can also be used for special applications, such as creating a phantom center channel, or used as part of a PLF/solo support function. The 2-channel monitor output section is switched, using electromechanical relays, to allow connection of two separate loudspeaker systems. Protection circuitry provides power-up and powerdown protection for the loudspeakers. A 2-channel meter output provides a

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“reference” signal, and is not affected by the monitor output’s level-control circuitry.

The inputs, inserts, and monitor outputs are electronically balanced, while the meter outputs are unbalanced. Fifteen-turn trim potentiometers are used to precisely calibrate the input, insert return, and monitor output signals. Audio input, insert, and output connections are made using three 25-pin D-subminiature connectors. The connectors follow an industry-standard multi-channel wiring scheme. Two 9-pin D-subminiature connectors are used in a simple loop-through arrangement to connect the Model 58 to a Model 59 Control Console, as well as to additional Model 58 units.

An 8-bit micro-controller provides the logic “horsepower” for the Model 58. DIP switches are used to select the Model 58’s unit ID and operating mode. AC mains power is connected directly to the Model 58, which is factory selected for 100, 120, 220/240V operation. The internal power supply utilizes a toroidal mains transformer for quiet audio operation.

Model 59 Control Console

The Model 59 Control Console is a compact, self-contained unit designed to be located at the operator’s position. It allows fingertip control of all monitoring parameters. Numerous LEDs provide complete status information. The Model 59 supports up to eight output channels, and up to four, 8-channel input sources. The actual

Figure 1. Model 58 Central Controller Front Panel

Input

trimpots

Insert 1

return trimpots

Figure 2. Model 58 Central Controller Back Panel

AC mains

connection

To/from

Model 59

Control

Console

to additional

return trimpots

Loop thru

connector

Model 58

Insert 2

Monitor out

trim pots

connections

Output

Insert

connections

Configuration DIP switches

Data

active LED

Input

connections

Power

present LED

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Mute/solo

mode select

Inserts 1 & 2

Input

Sources

1-4

for Surround

Output channel

mute/solo

Remote control input activity LED

Monitor Output

• Output A/B select

• Reference level

• Mute all

• Dim

• Rotary level control

Figure 3. Model 59 Control Console Front Panel

operating configuration simply depends on the number of Model 58 Central Controller units which are connected.

The Model 59 provides four buttons and associated LEDs for selection of the input source to be monitored. While in most cases only one input source will be monitored at a time, multiple inputs can be selected for simultaneous monitoring. This allows two, three, or all four of the inputs to be combined (“summed”). While there is no independent control of the input levels, this feature can be useful for creating rough mixes from the source signals. It is also a fast, effective means of making a “seat-of-the-pants” check on the phase relationship between synchronized signals.

The monitor output level is controlled either through the use of a large, easyto-use rotary control, or by enabling the

preset reference level. For operator convenience, the dim function allows the monitor output level to be reduced by a fixed dB amount. The mute all function disables all monitor outputs by activating the mute relays on the Model 58 Central Controller units. A push-button switch and two LEDs are used to select the desired monitor output—either A or B.

The StudioComm’s two insert sections are directly accessible using push-button switches. While they can perform a standard insert action, they can also be used to provide a wide range of muting, routing, and summing functions. Each insert can be configured, on a channel-by-channel basis, to act in one of four modes: Mute, maintain connection of the normal signal, insert the return signal in place of the normal signal, or sum the return signal with the normal signal.

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Control of the individual output channels is provided by the mute/solo section. One push-button switch sets the operating mode for either mute or solo. In the mute mode, individual channels can be muted or un-muted as required. In the solo mode, one channel can be monitored while the others are automatically muted. (Of course, multiple channels can be simultaneously selected for “soloing.”) The flexibility of having both mute and solo available allows an operator to quickly select the most comfortable and productive operating mode.

A major strength of the Model 59 is the ability to configure, under software control, many operating parameters. During initial installation the Model 59 is “taught” the number of output channels to be controlled, the number of channels associated with each of the four inputs, and the routing to be performed by the insert sections. The monitor output reference level is set

by taking an electronic “snapshot” of the position of the rotary level control. The dim level is selected from among four choices. A number of other operating parameters can also be configured, including how the remote contact and level control inputs will function. All configuration parameters are stored in non-volatile memory.

A Model 59 Control Console connects to a Model 58 Central Controller using a standard 9-pin D-subminiature cable. Multiple Model 58 units connect together in a bus fashion. Power for the Model 59 is provided by the Model 58s. The Model 59 generates MIDI system-exclusive messages to control the Model 58 units. Remote control signals connect to the Model 59 via pins in the 9-pin interconnecting cable.

Remote Control Capability

Three remote control functions can be easily implemented: Mute all or dim, insert

Figure 4. Multi-Channel Monitor System Showing Four Model 58 Central Controllers Interconnected with Bus Assembly

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1 or 2 enable, and monitor level. Contact input 1 can be configured as either a remote mute all or a remote dim function. This supports external functions such as talk back or slate. Contact input 2 can be used to remotely enable insert 1 or 2, allowing the PFL/solo function on an audio console to be interfaced with the StudioComm for Surround system. Using a standard linear-taper potentiometer, a remote level control can be implemented; no special optical encoder or buffer circuitry is required. The remote control functions allow creation of a secondary monitoring position, such as a producer’s or director’s desk or seating location where level control or muting may be desired. Provisions have been made in the StudioComm’s operating software to ensure that critical listening is not affected by remote activity.

Expanded Input Capability

In the standard operating mode the Model 59 Control Console is designed to support up to four Model 58 Central Controller units. This provides eight output channels, and allows connection of up to four 8channel sources. A special mode can be enabled that lets a slightly modified Model 59 support up to eight Model 58 units. This mode will again support eight output channels, but will now allow connection of up to eight 8-channel sources. Specialized playback applications, such as large screening rooms at motion picture studios, can benefit from this expanded operating mode. Contact the factory for details.

Limitations on Signal Routing

While a StudioComm for Surround system for multi-channel monitoring will do many wonderful things, it is not designed to selectively route input signals to the differ-

ent output channels. An input-channel-tooutput-channel relationship is maintained. A signal that arrives on input 2, channel 6 will, when selected, output only on monitor and meter output channel 6. Any rerouting of the input signals must be done prior to connection to the StudioComm for Surround system. This should not be an impairment in most facilities, but it’s important to highlight this fact.

Applications

Configuration Examples

It can initially be confusing to fully understand how a Model 59 Control Console and multiple Model 58 Central Controllers work together to create a multi-channel monitor system. How the input and output channels are assigned to the Model 58 units can seem especially tricky. In this section several examples are provided that should present a clear picture of how things go together. A careful review of the associated diagrams should quickly make you feel more comfortable. The flexibility of the StudioComm for Surround system is both a blessing and a curse. A simpler system would make installation a “no brainer,” but in the long run having the ability to achieve your operational goals is of overriding importance.

6-Channel (5.1) Configuration

Figure 5 provides an overview of a typical 6-channel installation. The channels are organized in the standard 5.1 arrangement: left, center, right, left surround, right surround, and sub. The sub or subwoofer channel is sometimes referred to as the LFE (low frequency enhancement) channel. (The term LFE is actually more descriptive but, as of this writing, isn’t as

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commonly used.) Two 6-channel audio sources and one set of amplified monitor loudspeakers are connected. Note carefully how the channels are assigned: Model 58 unit 1 supports the left channel and the center channel, Model 58 unit 2 supports the right channel and the left surround channel, and Model 58 unit 3 supports the right surround channel and the subwoofer channel. Three input and three output wiring harnesses are required, each connecting to the Model 58s with 25-pin D-subminiature plugs. These wiring harnesses are not included with the StudioComm for Surround system.

The Model 59 Control Console is connected to Model 58 unit 1 using a 9-pin

“D-sub” interconnecting cable. The three Model 58 units are linked together using the ribbon cable bus assembly. Both the 9-pin interconnecting cable and ribbon cable bus are provided with the StudioComm for Surround system. AC mains power needs to be connected to each of the three Model 58s. In this example installation many of the available resources are not utilized, including the third and fourth 6-channel inputs, the insert sections, the meter outputs, and the remote control functions.

4-Channel (LCRS) Configuration

Figure 6 shows a 4-channel installation that follows the traditional LCRS format:

Figure 5. Example of 6-Channel (5.1) Configuration

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Figure 6. Example of 4-Channel (LCRS) Configuration

left, center, right, and surround. Again, two 4-channel sources are connected, along with one set of amplified loudspeakers. The left and center channels are supported by Model 58 unit 1, while the right and surround channels are supported by Model 58 unit 2. A processor device is connected to one of the insert sections on both Model 58 units. Two input, two insert, and two output wiring harnesses are utilized for audio interconnection.

The Model 59 Control Console is connected to Model 58 unit 1, and both Model 58s are interconnected using the ribbon cable bus assembly. AC mains power must be connected to both Model 58 units. Many features are available for future use, including inputs 3 and 4, the second insert section, the meter outputs, and the remote control functions.

Inserts

The Model 58 insert sections are applicable for far more than the usual console inserts functions. Under control of the Model 59 Control Console, each insert channel can independently function in one of four modes: mute normal signal flow, maintain the normal signal flow, replace the normal signal with the return signal, or sum (combine) the return signal with the normal signal. (Note that in all cases the insert send signal will remain active.) With this flexibility the inserts can be used for a variety of insert, routing, and mixing functions.

Using the insert returns, in conjunction with contact input 2, allows a console’s AFL/solo system to be directly integrated. The console’s source of AFL/solo audio

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(usually the stereo monitor output) can be connected to the insert returns associated with the left and right channels. With this arrangement, whenever the console’s AFL/solo system is active, the audio will automatically be monitored, overriding the normal audio source. (Refer to the remote control input paragraphs of the Installation section for details on connecting to contact input 2.)

The decision as to which insert section to utilize for an AFL/solo function depends on how the AFL/solo signal should flow through the system; pre or post, relative to the other insert section. In most cases using insert 2 is preferable, ensuring that the AFL/solo signal will not be processed by insert 1.

A “phantom” center channel can be easily created by connecting the insert send of a surround channel to the insert returns on the channels designated for left and right. However, with this implementation, a level “buildup” problem may occur. If this is the case, the source of the phantom center may need to be attenuated by 6dB (voltage). This would be easily accomplished using a resistor “pad” to drop the level. With the insert sends capable of driving 600 ohm loads, a simple three resistor pad would work well; two 150 ohm and one 300 ohm resistor would do the trick.

Remote Control

Provision has been made to allow remote control of several operating parameters. Contact input 1 allows remote activation of the mute all or dim functions. Contact input 2 allows remote activation of the insert 1 or insert 2 functions. The level control input allows remote control of the monitor output level. The exact functioning

of the remote inputs is dependent on the configuration of Model 59 Control Console parameters. Refer to the Configuration section of this guide for details.

Remote control of mute all or dim is provided to allow a variety of applications to be supported. Placing a mechanical switch adjacent to a telephone, allowing personnel to conveniently mute the monitor loudspeakers, is a perfectly acceptable application. Allowing a talk-back system to automatically dim the monitors is another typical application.

Remote control of insert 1 or insert 2 was specifically provided to support interfacing with an associated console’s PFL/solo system. By connecting to an electronic signal that indicates when the PFL/solo system is active, audio signals connected to insert return 1 or 2 will be automatically monitored.

The remote level control input is one of those features which is rarely going to be used, but if you need it, you’ll really need it! (Without having support built into the Model 59 Control Console’s hardware and software, it would be almost impossible to add a remote level control later.) The remote level control input was provided specifically to allow a producer, director, or other “big cheese” to have their own level control for use when previewing motion picture or video work-in-process. The remote level control input, along with the remote mute all and dim functions, makes it simple to create a small control console for secondary locations.

Note that software “smarts” in the Model 59 Control Console inhibits the use of the remote level control any time the operator selects the reference output level. This

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ensures that the calibrated monitor level won’t accidentally be changed by some maroon. This, along with a remote activity LED indicator on the Model 59, keeps the remote level control from doing more harm than good.

Installation

In this section you will be installing the one or more Model 58 Central Controllers in an equipment rack. Multiple Model 58 units will be interconnected using the bus assembly. Audio input, insert, and output connections will be made. A location will be selected for the Model 59 Control Console, and it will be connected to one of the Model 58 units. If required, external equipment will be interfaced with the remote control inputs. AC mains power will be connected to the Model 58 units.

System Components

The main shipping carton contains the Model 58/Model 59 base configuration. This consists of one each of the following: Model 58 Central Controller, Model 59 Control Console, 20-foot (6.1m) 9-pin D-subminiature interconnecting cable, ribbon-cable bus assembly, User Guide, and warranty card. Units destined for North America also include an AC mains cord. Your dealer or distributor will provide an AC mains cord for non-North American destination. Each additional Model 58 Central Controller is shipped in a separate carton. These Model 58 “solo” units include a warranty card and, where applicable, an AC mains cord.

Mounting Model 58 Central Controllers

Each Model 58 Central Controller requires one space in a standard 19-inch (48.3cm) equipment rack. Select a location that is convenient to both the analog audio signals and the Model 59 Control Console. A 20-foot (6.1m) cable is supplied to connect the Model 58 units to the Model

59. You can supply your own interconnecting cable, however 50 feet (15.3m) is the recommended maximum length. Secure each Model 58 in the equipment rack using two mounting screws per side.

Consider selecting a mounting location that can accommodate future expansion. If, for example, you are installing three Model 58 units to create a 6-channel system, you may want to leave room in the rack for one additional Model 58. This will make upgrading to an 8-channel system simple; install a fourth Model 58 and you’re ready to go.

Interconnecting the Model 58 Units

In most applications multiple Model 58 units are going to be used together to create a multi-channel monitor system. To assist in this purpose, a ribbon-cable bus assembly is provided with each Model 58/ Model 59 base configuration. The bus assembly contains four 9-pin D-sub plugs, spaced 2 inches apart, allowing up to four Model 58s to be interconnected. Refer to Figure 4 for a diagram depicting the interconnection of four Model 58 units. Each Model 58 contains a 9-pin D-sub connector labeled LOOP THRU. Use the bus assembly to link these connectors together. Locking hardware for the plugs is not included as it is unnecessary for

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reliable interconnection. (If you are the compulsive type, the D-subs on the Model 58 use 4-40 threads.)

Audio Input, Output and Insert Connections

Audio input and output connections are made by way of three 25-pin D-subminiature (“D-sub”) connectors. Located on the Model 58’s back panel, the connectors are labeled INPUTS, INSERTS, and OUTPUTS. Three cable harnesses, each with a 25-pin D-sub plug (male) on one end, and the desired connectors on the other end, are necessary. These cable harnesses are not supplied by Studio Technologies.

The wiring scheme used by the D-subs comply with that made familiar by TASCAM with their DA-88 product. A wiring harness prepared for the Model 58 input channels would be identical to that of a DA-88 input harness. A wiring harness prepared for the Model 58 output channels would be identical to that of a DA-88 output harness. A harness for the Model 58 inserts and outputs would be wired in a slightly different fashion. Please refer to Figures 7, 8, and 9 for exact connection details. Note that the Model 58’s D-sub connectors use 4-40 threads.

When it came time for Studio Technologies to test the first Model 58 Central Controller, standard DA-88 harnesses were purchased. They turned out to be of very good quality, and at a reasonable price. Unless there’s a special need, it may be cost and time effective for you to purchase commercially made cable assemblies. Let the large market for DA-88style cabling help you painlessly install your system!

Line Inputs

The connector labeled INPUTS is used to interface with the eight line input circuits. Please refer to Figure 7 for details on the exact “pin out” of the D-sub connector. The electronically balanced input circuitry is intended for connection to balanced or unbalanced sources with a nominal signal level of +4dBu. A trim potentiometer is associated with each input, allowing adjustment of the input sensitivity over a ±2dB range. The configuration sections of this guide provides details on using the trim pots.

Balanced sources should be wired so that signal high is connected to + on the D-sub, signal low to – on the D-sub, and shield to the D-sub’s shield connection. With an unbalanced source connect signal high to the + connection on the D-sub, and shield to both the – and the shield connection on the D-sub. If connecting to an unbalanced source in this manner results in hum or

Signal Signal

Connection High (+) Low (–) Shield

IN 1-1 24 12 25 IN 1-2 10 23 11 IN 2-1 21 9 22 IN 2-2 7 20 8 IN 3-1 18 6 19 IN 3-2 4 17 5 IN 4-1 15 3 16 IN 4-2 1 14 2

Notes: 1) Connector type on Model 58 is 25-pin

D-subminiature female. Installer must provide plug (male). Connector uses 4-40 threaded inserts for locking with mating plug.

2) Wiring scheme follows Tascam DA-88 convention. Standard DA-88-type wiring harnesses are directly compatible, with the exception of 4-40 screw threads being required.

Figure 7. Connector Pin Out for Inputs

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noise, connect signal high to + on the D-sub, and shield to – on the D-sub; leave the shield connection on the D-sub unterminated.

It is important that at least one of the multi-channel inputs be wired by way of an audio patch bay. This will allow the channels associated with an input source to be easily rerouted. While signals generated within a facility will usually follow a specific format, such as L, C, R, LS, RS, Sub, it is possible that media provided by an outside source will follow a different one.

Outputs

The connector labeled OUTPUTS provides access to the two, 2-channel monitor outputs and the 2-channel meter output. Please refer to Figure 8 for details on the exact “pin out” of the D-sub connector.

Signal Signal

Connection High (+) Low (–) Shield

MONITOR A-1 24 12 25 MONITOR A-2 10 23 11 MONITOR B-1 21 9 22 MONITOR B-2 7 20 8

METER 1 18 6 (See Note 3) 19

METER 2 4 17 (See Note 3) 5 NOT USED 15 3 16 NOT USED 1 14 2

Notes: 1) Connector type on Model 58 is 25-pin

D-subminiature female. Installer must provide plug (male). Connector uses 4-40 threaded inserts for locking with mating plug.

2) Wiring scheme loosely follows Tascam DA-88 convention. Modified DA-88-type wiring harnesses are required, along with 4-40 screw threads.

3) Meter outputs are unbalanced. Pins 6 and 17 internally connected to Model 58 shield.

Figure 8. Connector Pin Out for Outputs

The monitor outputs are intended for connection to audio amplifiers associated with monitor loudspeakers, or to the inputs of loudspeakers with integrated amplifiers. Note that there are two monitor output circuits which are switched, using relays, to the 2-channel A and B output connections. Under normal operation only one set of outputs, A or B, will be active at the same time. The output which is not active has a short-circuit placed across its connections.

Note: While the electronically balanced output circuits are capable of driving loads of 600 ohms or greater, the output level will drop slightly as the load impedance approaches 600 ohms. A

0.5dB difference in output level can be expected as the load impedance changes from 10k ohms to 600 ohms. This applies to all of the electronically balanced output circuits provided on the Model 58.

The monitor outputs are electronically balanced and are capable of driving balanced or unbalanced loads of 600 ohms or greater. While balanced operation is preferred, unbalanced operation does not pose a problem. To connect to an unbalanced load connect the + terminal of the D-sub as signal high, and both the – and shield as the signal low/shield. For optimal unbalanced operation, it is important to connect both – and shield together directly on the D-sub, and not at the other end of the harness.

The same source, or sources, that feed the monitor outputs are fed to meter outputs. The major difference is that the meter outputs are not affected by the

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monitor output level control circuitry; they are pre-fader (pre-VCA).

The meter outputs are intended for connection to the inputs of various mechanical, electronic, or electromechanical meter systems. These could range from conventional analog “VU” or “PPM”-type meters, to projection meter systems used in motion picture applications. The meter outputs can also serve as an additional audio output for special applications, such as a copy or “dub” output. In addition, the meter outputs serve an important role in the input calibration process, which is discussed in the Configuration section of this guide.

The meter outputs are unbalanced, have a nominal level of +4dBu, and are capable of driving loads of 600 ohms and greater. Even if the meter outputs are not going to be used during normal operation it is important to provide access to them. To correctly and accurately calibrate the system input-to-output gain an audio level measurement device must be able to be temporarily connected to the meter outputs. While not absolutely necessary, terminating or routing the meter outputs to points on an audio patch bay may prove very helpful for long-term maintenance assistance.

Inserts

The connector labeled INSERTS is used to interface with the two, 2-channel insert sections. Please refer to Figure 9 for details on the exact “pin out” of the D-sub connector. The use of the insert sections will depend on the requirements of the specific installation. In certain cases the inserts sections won’t be required, and no connections will need to be made.

The insert sends are electronically balanced, have a nominal level of +4dBu, and are capable of driving balanced or unbalanced loads of 600 ohms or greater. While balanced operation is preferred, unbalanced operation is not a problem. To connect to an unbalanced load connect the + terminal of the D-sub as signal high, and both the – and shield as the signal low/shield. For optimal unbalanced operation, it is important to connect both – and shield together directly on the D-sub, and not at the other end of the harness.

Note that the insert sends do not have level trim potentiometers associated with them. The output levels are nominally +4dBu, with channel-to-channel variation of up to ±0.5dB considered normal. It is anticipated that the equipment connected to the insert sends will have, if required, input level adjustment controls.

The insert returns are electronically balanced, have a nominal input level of

Signal Signal

Connection High (+) Low (–) Shield

SEND 1-1 24 12 25

RETURN 1-1 10 23 11

SEND 1-2 21 9 22

RETURN 1-2 7 20 8

SEND 2-1 18 6 19

RETURN 2-1 4 17 5

SEND 2-2 15 3 16

RETURN 2-2 1 14 2

Notes: 1) Connector type on Model 58 is 25-pin

D-subminiature female. Installer must provide plug (male). Connector uses 4-40 threaded inserts for locking with mating plug.

2) Wiring scheme loosely follows Tascam DA-88 convention. Modified DA-88-type wiring harnesses are required, along with 4-40 screw threads.

Figure 9. Connector Pin Out for Inserts

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+4dBu, and are compatible with balanced or unbalanced sources. A trim pot is associated with each insert return, allowing the input sensitivity to be adjusted over a ±2dB range. Refer to the Configuration section of this guide for details on using the trim pots. Note that connection of unbalanced sources should follow the procedure described in the section covering the line inputs.

Connecting the Model 59 to a Model 58

A cable utilizing a 9-pin D-sub plug (male) on each end is used to interconnect a Model 59 Control Console with a Model 58 Central Controller. A 20-foot (6.1m) cable is provided with each Model 58/Model 59 base configuration.

that is going to be configured with unit ID 1.

Remote Control Connections

The remote control input circuitry is physically located in the Model 59 Control Console. Access to the remote control inputs is by way of the 9-conductor cable that links the Model 59 with the Model 58 Central Controllers. In fact, five of the nine connections in this D-sub are dedicated for use by the remote control inputs and have nothing directly to do with the Model 58 Central Controller. Since all the 9-pin D-sub connectors on the Model 58 units are connected in parallel, access to the remote control inputs is made using any available 9-pin D-sub on any of the Model 58 units. Refer to Figure 10 for a detailed description of the 9-pin D-sub connections.

Should a cable of different length be required it should be wired in a one-to-one fashion for all 9 pins. Pin 1 carries signal common, and must be connected at both ends. A shield connection from the cable should be connected to pin 1 at one, or both, ends. For best performance the cable generally should not exceed 50 feet (15.3m) in length. The reality is that a cable much longer in length should work, as long as an excellent-quality cable is utilized. We define “excellent” as extensive shielding along with very low capacitance. The low cable capacitance limits the amount of data-signal waveform distortion. As far as the maximum length, go ahead and try it—if it works, it works!

Each Model 58 contains a 9-pin D-sub, labeled TO/FROM CONTROL CONSOLE. Select one of these for connection to the Model 59. While it doesn’t technically matter which Model 58 is selected, it is often best for clarity to use the Model 58

Pin Signal Direction

1 Common, Model 58 units to

2 +15V Model 58 units to

3 Data Current Model 59 to

4 Common Model 59 to

5 Contact Input 1 Remote Contact to

6 Contact Input 2 Remote Contact to

7 CCW Remote Level

8 Wiper Remote Level

9 CW Remote Level

Notes: 1) Connector type on Model 58 is 9-pin D-subminiature

Figure 10. Connector Pin Out for Control Console and Loop Thru Connections

Power Supply Model 59

Model 59

Source Model 58 units

Model 58 units

Model 59

Level

Control

female. Connector uses 4-40 threaded inserts for locking with mating plug.

Potentiometer to Model 59

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Contact input 1 and contact input 2 are +5V logic signals which are active when they are brought to the logic low state. While the inputs are protected from overcurrent and static (ESD) discharge care should be taken to prevent nasty signals from reaching them. To activate contact input 1 simply connect pin 5 to system common, pin 4. To activate contact input 2 connect pin 6 to pin 4. The contact inputs are active when held in the low state; they can’t be configured to change states (“latch”) in response to a logic pulse.

All that is required to add a remote level control is to connect a commonly available linear taper potentiometer. (Yes, use a linear pot! Software in the Model 59 Control Console converts its performance to log.) Any high-quality pot with a nominal “coil” resistance of between 1k and 25k ohms should work fine. Simply connect the pot in this fashion: pin 7 to counterclockwise, pin 8 to wiper, and pin 9 to clockwise. As very little current travels through the wiring and pot, there is really no practical maximum cable length. Be aware that the longer the cable run, the more chance that an accidental short circuit could take place. This would cause the monitor level to go to maximum.

AC Mains Power

The Model 58 is internally configured to operate from either 100, 120, or 220/240V, 50/60Hz. Units shipped to North America are factory selected for 120V operation. Units bound for Japan are selected for 100V, while our friends “down under” and in Europe receive units set for 220/240V. Before connecting the Model 58 to mains power, check that it is configured to match the local mains voltage. Look on the back panel (adjacent to the power entry connector) for the configured voltage(s). Note than an incorrect configuration could seriously damage the unit. Should it be necessary to change the unit’s operating voltage it must be performed only at the factory or by an authorized service technician.

The Model 58 uses an IEC standard connector to mate with the AC mains cord. The wire colors in the AC mains cord should conform to the internationally recognized CEE color code and must be wired accordingly:

Connection Wire Color Neutral (N) Light Blue

Line (L) Brown Protective Earth (E) Green/Yellow

Warning: Connecting to the remote level control input requires very careful attention to wiring and potentiometer connections. Shorting pin 8 of the 9-pin D-sub connector to common will raise the monitor output level to maximum! To address hearing safety issues, the Model 59 is default configured to disable the remote level control input. A safe and reliable installation must be

Safety Warning: The Model 58 does not contain an AC mains disconnect switch. As such, the mains cord plug serves as the disconnection device. Safety consideration requires that the plug and associated outlet be easily accessible to allow rapid disconnection of mains power should it prove necessary.

completed prior to enabling the input.

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As soon as mains power is applied, the Model 58’s power present LED will light. The Model 59 will go through its power-up sequence lighting each LED in a rapid sequence.

Note that any time a Model 58 configuration DIP switch is changed, mains power on all Model 58 units must be discon- nected and reconnected. This ensures that the logic circuitry is fully reset to the new operating parameters. (This is not a bug in software—we designed it this way to ensure that the performance would be correct!) Refer to the Configuration section of this guide for details on setting the DIP switches.

Configuration

After the physical installation has been completed, several configuration issues must be addressed. On the Model 58 Central Controllers, the unit ID and operating mode must be set. In addition, the input and output signal levels must be calibrated using the trim potentiometers. As a final step, the operating parameters of the system will be set using the Model 59 Control Console’s configuration mode.

Note that any time a Model 58 DIP switch is changed, the data LED (located to the right of the switches) will flash. This is normal, being provided for factory confirmation of switch operation.

Model 58 Unit Identification Numbers

A unique unit identification (ID) number must be assigned to each Model 58. This allows commands from the Model 59 Control Console can be correctly interpreted. A simple binary method sets the

unit ID, using positions one through four of an 8-position DIP switch, which is located on the front panel. The DIP switch positions are labeled 1-8, with position 1 on the left side. A switch in the off (down) position is considered to be in the 0 state. A switch in the on (up) position is considered to be in the 1 state.

Setting the unit ID is very simple: A Model 58 set for unit ID 1 supports output channels 1 and 2 on the Model 59, a Model 58 set for unit ID 2 supports output channels 3 and 4, etc. A system using three Model 58 Central Controllers to create a 6-channel monitor system would have unit ID numbers 1, 2, and 3 assigned. Refer to Figure 11 for the exact DIP switch settings.

You curious types might wonder why four bits were reserved for unit IDs, rather than just two or three. In most cases, only the first four unit ID numbers will be used,

Unit ID DIP Switch 1-4

1 0000 2 1000 3 0100 4 1100 5 0010 6 1010 7 0110 8 1110

9 0001 10 1001 11 0101 12 1101 13 0011 14 1011 15 0111 16 1111

Figure 11. Model 58 DIP Switch Settings for Unit ID

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allowing creation of an 8-channel monitor system. In some special applications up to eight Model 58 units can be used together, utilizing unit ID numbers 1-8. (This is the single-channel mode that will be discussed in Appendix B.) Unit ID numbers 9-16 are reserved for future applications, the likes of which even we haven’t the foggiest idea about—hopefully smart users like you will come up with some cool ideas for us to implement!

Model 58 Operating Mode

DIP switch position 5 is used to set the Model 58 Central Controller’s operating mode. In the off (down) position, the unit operates in the normal 2-channel mode. In the on (up) position, the unit operates in a special single-channel mode. In the 2-channel mode each Model 58 supports two output channels and four 2-channel input pairs. This is correct for use with the standard Model 59 Control Console. If this is your application, ensure that DIP switch 5 is in the off (down) position.

The single-channel mode is provided for special applications where the eight Model 58 input channels need to be routed to the same output channel. Contact Studio Technologies for details.

After the Model 58 unit ID and operating mode configurations have been set, the AC mains power for all units must be simultaneously disconnected, then reconnected. This ensures that the previous configuration is completely erased and the new one is correctly implemented.

Level Calibration

Fourteen multi-turn trim potentiometers grace the front panel of the Model 58 Central Controller. Eight are provided for the line inputs, four for the insert returns, and two for the monitor outputs. Taking time to carefully adjust the trim pots will ensure that accurate monitoring can take place. Each trim pot allows an adjustment range of ±2dB, which is spread over the trim pot’s 15 turns. Calibrating the levels down to a tenth of a dB is easily performed.

The meter outputs are used as the measuring point when adjusting 12 of the trim pots. Unless precision level meters are already connected to the meter outputs, a laboratory-grade audio level meter is required. In addition, the audio sources connected to the line inputs must be configured to generate steady signals at their nominal operating level. Those interested in where the trim pots are located in the circuitry, and why the meter outputs are specified as the main measurement point, should refer to the Model 58 Block Diagram, located at the end of this guide.

Input Trim Pots

This first procedure will ensure that all Model 58 line inputs are level matched against each other. The audio sources connected to these inputs are normally arranged as four 2-channel pairs; 1 and 2, 3 and 4, 5 and 6, 7 and 8. The trim pots will be adjusted in pairs corresponding to the input sources. In this procedure it is assumed that precision metering devices are not connected to the meter outputs.

1. On the first Model 58, connect the audio level meter to meter output 1.

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2. Using the Model 59 Control console, select input 1 as the audio source. Be certain that insert 1 and 2 are not enabled. Enable the mute all function, ensuring that you won’t have to hear a steady tone during the entire procedure!

3. Confirm that the audio source connected to input 1 is generating a steady signal at precisely its reference level. (This is assumed to be nominally +4dBu.)

4. Observing the level meter, adjust input trim pot 1 to give a +4dBu level at meter output 1.

5. Disconnect the level meter from meter output 1 and reconnect it to meter output 2.

6. Observing the level meter, adjust input trim pot 2 to give +4dBu.

7. Repeat steps 1-6 for line inputs 2, 3, and 4.

Once all eight line inputs on the first Model 58 have been calibrated, repeat the entire procedure for the additional Model 58 units.

The following procedure would be appropriate when an insert section is configured to place another device in the audio path. A device commonly used in this type of application would be a surround sound encode/decode unit. The procedure also assumes that precision metering devices are not connected to the meter outputs.

1. On the first Model 58, connect the audio level meter to meter output 1.

2. Using the Model 59 Control console, select input 1 as the audio source. Confirm that inserts 1 and 2 are disabled. Enable the mute all function, ensuring that you won’t have to hear a steady tone during the entire procedure!

3. Confirm that the audio source connected to input 1 is generating a steady signal at precisely its reference level.

4. Observing the level meter, confirm that the output level is exactly +4dBu. (If this is not the case, the input trim pot must be re-calibrated.)

5. Using the Model 59 Control Console, enable insert 1.

Insert Return Trim Pots

Describing the calibration process for the insert returns is a bit more difficult as the exact implementation of the insert sections is dependent upon the specific installation. The goal is to have no level change occur when switching an insert section between disabled and enabled. Note that the insert send outputs are not calibrated for a precise +4dBu nominal level. Trim pots on the insert returns allow inaccuracies in the connected device’s input and output levels

6. Observing the level meter, adjust the trim pot associated with insert 1, return 1 to give a +4dBu level.

7. Disconnect the level meter from meter output 1 and reconnect it to meter output 2.

8. Repeat steps 4, 5, and 6 for insert 1, return 2.

9. If insert 2 is being utilized, repeat the procedure for its two return trim pots.

to be accounted for.

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Once the insert returns on the first Model 58 have been calibrated, repeat the entire procedure for the additional Model 58 units.

Monitor Output Trim Pots

A trim potentiometer is associated with each of the two monitor output circuits. Note that while there are two 2-channel monitor output connections—A and B— there is only one pair of output circuitry. Relay contacts are used to switch the output circuits between the A and B connections. Installation-specific requirements will dictate how the monitor output trim pots are to be adjusted. In most cases the trim pots will be adjusted to give exactly the same output level on all the channels. Other installations may require the trim pots to be adjusted in reference to the outputs of the audio power amplifiers. For this discussion, we’ll describe how to match the output levels of the monitor outputs.

1. Start by turning off the AC mains power on all audio power amplifiers. If loudspeakers with integrated amplifiers are being used, turn them off too. This “power down” is critical, ensuring that high-level test signals do not get sent to the loudspeakers. Don’t mess around—turn off the amps now!

2. Confirm that the audio source connected to input 1 is generating a steady signal at precisely its reference level.

3. Using the Model 59 Control Console, select input 1 as the audio source. Enable monitor output A. Confirm that inserts 1 and 2, as well as the mute all and dim functions are disabled. Slowly turn the rotary level control clockwise.

If audio is heard, stop raising the level and turn off any active amplifiers. Turn the control until it is fully clockwise, providing the maximum monitor output level.

4. Connect the precision audio level meter to channel 1 of monitor output A.

5. Observing the level meter, adjust monitor output trim pot 1 to give exactly +4dBu.

6. Disconnect the level meter and connect it to channel 2 of monitor output A.

7. Observing the level meter, adjust the monitor output 2 trim pot to give exactly +4dBu.

8. Once the monitor outputs on the first Model 58 have been calibrated, repeat steps 4-7 for the additional Model 58 units.

9. On the Model 59 Control Console, turn the output level control to the fully counterclockwise position.

10. After confirming that the level control is fully counterclockwise, activate AC mains power to the audio amplifiers or amplified speakers.

Model 59 Operating Parameters

Many StudioComm for Surround functions can be configured to meet the exact needs of your installation. Here’s an overview of what you can configure:

• Number of output channels to be sup-

ported

• Input signals supported for each input

channel

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• Insert routing

• Remote controls

• Monitor output A/B select

• Reference level

• Dim level The Model 59 Configuration Charts, lo-

cated at the end of this section, give details on how each configuration parameter is set. An overview of the parameters is provided in the following paragraphs.

Entering the Configuration Mode

A small button is located on the back of the Model 59 Control Console, adjacent to the 9-pin D-sub connector. Pressing and holding this button for two seconds places the Model 59 into the configuration mode. In the configuration mode the buttons and LEDs no longer perform their normal function, but instead allow you to observe and change many of the operating parameters. The mute/solo mode LEDs light alternately to indicate that the configuration mode is active. Once again pressing and holding the configure button returns the Model 59 to normal operation. Note that configuration changes are stored only after the configuration mode is exited by pressing and holding the button.

Our apologies to those of you who find the configure button a pain to use, but it’s supposed to be that way! Seriously, the top of the button is slightly recessed from the back panel, making it harder to accidentally activate. We don’t want normal operation to cease because someone pushes the Model 59 into a “rats nest” of track sheets!

When to Use the Configuration Mode

There is no problem frequently “tweaking” the Model 59’s operating parameters to achieve the desired performance. The non-volatile memory chip is rated for thousands of read and write cycles, and has its retention time rated in years.

Output Channels Supported

The Model 59 hardware and software supports up to eight output channels. The Model 59 is configured, from the factory, to generate commands for all eight outputs. This would be correct for an installation that uses four Model 58 Central Controllers operating in their dual-output-channel mode. But there will often be cases where one, two, or three Model 58 Central Controllers will be installed, creating 2-, 4-, or 6-channel systems. By configuring the Model 59 to disable the unused output channels, operator clarity is enhanced. Specifically, the output mute/solo mode buttons and LEDs for the unused output channels will be disabled, along with the underlying functionality. With the unused output channels disabled, an operator can’t accidentally select those channels for solo or mute operation.

Supported output channels should always start at channel 1 and run consecutively to the last channel. For example, a 6-channel system should support output channels 1-6, with channels 7 and 8 disabled. A 4-channel system should have channels 1-4 active, and 5-8 disabled.

Input Channels Supported

This configuration is a bit tricky to understand, but it is really quite simple—if we’re

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clear on our explanation, that is! The number of channels associated with each of the four inputs is dependent on the number of output channels. As an example, a system that consists of one Model 59 Console and three Model 58 Central Controllers supports six output channels, and four 6-channel input sources. The configuration parameter for the number of input channels supported is provided for those special cases where a source has less channels than the number of output channels.

Let’s look further at our mythical example, the 6-channel system. Inputs 1 and 2 are connected to 6-channel sources, so everything is fine there. But the source for input 3 is only four channels. While the source for input 4 is stereo. This makes it not so “cool” for the operator to select input 3 or 4 for monitoring, as the unused input channels will get routed to the meter and monitor outputs. Will the unused input channels pick up lots of noise and hum? Unlikely, but why take the chance of having a problem. Simply use the input channels supported configuration to disable the unused channels associated with inputs 3 and 4. Now when inputs 3 or 4 are selected, only the active channels are monitored.

Note that when a channel associated with an input is disabled, the input routing circuitry, under software control, no longer selects it; the corresponding output channel does not mute. With our 6-channel example, when selecting input 4, the stereo source, all six output channels remain active, while the input routing circuitry does not select the four unused inputs. While to some this might seem confusing, and a design fault, it was implemented this way because multiple inputs can be selected for simultaneous monitor-

ing. A 6-channel source might be selected at the same time as a stereo source. Having the output mute/solo mode LEDs going on and off in response to the selected input sources would be very annoying!

A special mode has been included to allow an input to be disabled from being accessed by the operator. This might be useful, for example, when input 4 is not connected to a source, and has no valid reason to be selected. This might also be useful when connecting a special source to input 4, such as a house “tie line” or router output that shouldn’t normally be accessible. To disable an input is simple, just disable all eight channels associated with it. During configuration mode, all eight LEDs will flash to show that this function is active. Once the Model 59 is returned to the normal operating mode the disabled input simply cannot be selected.

Insert Sections

Configuring the insert sections is an excellent test of your manual dexterity. If you have any doubts about your ability, don’t chew gum at the same time! The insert sections are unique in their ability to be configured on a channel-by-channel basis. Each channel of each insert can be independently set for one of four operating modes: mute normal signal, maintain normal signal flow, replace the normal signal with the insert return signal, or mix the insert return signal with the normal signal. A detailed explanation of each mode follows:

Mode 1, mute normal signal. In this mode no signal flows through the insert section. This is effectively a channel mute function. The insert send continues to be active, but the insert return is not active.

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Mode 2, maintain normal signal flow. In this mode the normal audio signal continues to flow through the insert section. This is effectively a “no-insert function” function! The insert send continues to be active, but the insert return is not active.

Mode 3, replace the normal signal with the insert return signal. This is the conventional insert function that most consoles provide. The normal signal no longer flows through the insert. The return signal is connected into the signal path.

Mode 4, mix the insert return signal with the normal signal. In this mode the normal signal is still active in the signal path, with the insert return signal mixed (summed) with it. No level change is performed, they are mixed at nominal level. Any level reduction required to prevent “buildup” needs to be done externally.

If one of the insert sections is going to used as part of an ALF/solo function, the individual channels must be carefully configured. The insert channels that are connected to the AFL/solo audio should be set to mode 3. The unused insert channels must be set to mode 1.

A special mode has been included to allow an insert section to be disabled from operation. This is accomplished by configuring all eight channels to mode 2, maintain normal signal flow. With this configuration an operator can press the associated insert button “till the cows come home” and the function will never activate. This is another attempt at making the Model 59 “idiot proof.”

In many cases both insert sections may not be wired to external devices. This doesn’t mean that both insert sections can’t be used effectively. An unused insert

section could be configured to perform a special mute. An example would be to configure insert 2 to mute the surround channels, leaving only the front channels active. This would give an operator a quick way of checking the effect of the surround information on the total mix.

Monitor Output A/B Select

While the Model 58 Central Controller supports the connection of two sets of monitor loudspeakers, often only the A output will be used. The monitor output A/ B select button on the Model 59 Control Console can be disabled, preventing an operator from selecting output B. Only the A LED will be lit, and the button will be inactive.

Reference Level

For audio-with-picture applications it’s critical that mixing be done in reference to a known monitor loudspeaker level. This is often referred to as mixing to “85dB” on the monitors. The Model 59 Control Console allows a precise monitor output level to be stored, and then enabled by pressing the button labeled REF. Setting the REF level is very simple:

1. Place the StudioComm for Surround system in the normal operating mode, not the configuration mode.

2. Set up a precision sound pressure level (SPL) measuring device at the desired listening location.

3. Use the Model 59 Control Console to select the reference signal source, e.g., pink noise, as the input source. Be certain that the ref and dim functions are not active.

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4. Set the Model 59’s rotary level control to give the precise output level for the reference setting.

5. Being careful not to touch the position of the rotary level control, enter the configuration mode by pressing and holding the small button on the Model 59’s back panel.

6. Once the configuration mode has been entered, the output signals will mute. Again, don’t touch the rotary level control! Press and hold the reference button until its associated LED lights. This will take approximately 5 seconds. The LED lights to indicate that the new reference level has been stored.

7. Exit the configuration mode by again pressing and holding the configure button, located on the back panel of the Model 59.

This level is now permanently stored as the reference level. Only by repeating the procedure can the value be changed.

The output channels will again become active. Confirm that the correct level has been stored by pressing the ref button. The sound pressure meter should report your desired level.

Dim Level

The dim function is used to reduce the monitor output level by a preset amount. The reduction is in dB relative to the monitor output’s current level. By using the dim button on the Model 59, you can take a quick phone call without having to touch the level control. Also, a remote control signal can be connected, allowing an external button or associated equipment to activate the dim function. There are four dim level values available: 10, 15, 20, or 25dB.

Restore Factory Defaults

The restore factory defaults function is provided primarily for factory use. In this way a system can be shipped with the default settings selected. While you are welcome to use this function, be careful that your configuration efforts may be wasted. Specifically, note that the reference level is reset to minimum level. All the other parameters are fairly easy to set up, but resetting the ref level would require getting out the SPL meter and a calibrated signal source. This is a hassle you may not need!

You might wonder why you have to press and hold the ref button for 5 seconds before the value is stored. This is provided specifically so that some Bozo won’t accidentally change the ref level while they are playing around with the configuration mode! You have to know the secret to be able to store a new value.

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Model 59 Configuration Chart—Entering and Exiting Configuration Mode

Press and hold the configuration button for 2 seconds to enter or exit the configuration mode.

These LEDs will light alternately when configuration mode is active.

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Model 59 Configuration Chart—Input Channels Suppor ted

Press and hold an input button (one at a time) to display and select which channels associated with that input will be active.

When an input button is pressed, use these buttons to select which input channels will be active for that input.

When an input button is pressed, these LEDs display which input channels are active for that input. A lit LED indicates that the channel is active.

Default: All eight possible input sources are active for each input. Note: When all channels associated with an input are disabled, all LEDs will flash to indicate this condition.

In this mode the input is disabled from use during normal operation. If an input is not going to have a source associated with it, deselect all input channels! Then during normal operation this input will not be able to be selected, minimizing the confusion caused by selecting an invalid input source.

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Model 59 Configuration Chart—Output Channels Suppor ted

Press and hold the mode button to display and configure the number of output channels to be active.

When the mode button is pressed, use these buttons to select which output channels are to be active.

When the mode button is pressed, the LEDs display which output channels are to be active. An LED that is lit indicates that its associated output channel is active.

Default: All eight output channels active. Note: When no outputs are selected to be active all the LEDs flash to indicate an error condition.

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Model 59 Configuration Chart—Insert 1 and 2

When an insert button and an output channel button is pressed at the same time, use these buttons to select the insert mode.

Press and hold one of the insert buttons to allow the display and selection of the insert mode.

When an insert button is pressed, pressing the output buttons (one at a time) allows the display and selection of the insert mode.

When an insert button and an output channel button is pressed at the same time, the insert mode is displayed.

LED 1 lit means mode 1, mute normal signal flow; LED 2 lit means mode 2, maintain the normal signal flow; LED 3 lit means mode 3, replace the normal signal with the return signal; LED 4 lit means mode 4, sum (combine) the return signal with the normal signal.

Default: All channels associated with both inserts are in mode 3, return audio replaces normal audio. Note 1: This is the hardest configuration to understand and perform! Two buttons must be simultaneously pressed

to display the mode; three buttons must be simultaneously pressed to change a configuration. A little practice and it becomes easy!

Note 2: If all channels are set for mode 2 the insert function is disabled. This feature is provided so that the

operator won’t attempt to enable an unused insert, hopefully minimizing confusion.

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Model 59 Configuration Chart—Output Mode

When the Out A/B button is pressed, use these buttons to select the output mode. Press button 1 for the A only output mode; button 2 for the A or B output mode.

When the Out A/B button is pressed, the LEDs display the output mode. When LED 1 is lit the A only output mode is selected; when LED 2 is lit the A or B output mode is selected.

Press and hold the Out A/B button to display and select the output mode.

Default: A or B output mode.

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Model 59 Configuration Chart—Setting Ref Level

Press and hold the Ref button for 5 seconds to take a “snapshot” of the rotary level control’s present setting. The Ref LED will light when the value has been stored.

Default: Fully attenuated (minimum) output level. Note: The 5-second delay is a safety feature, ensuring that the ref level will not be accidently changed.

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Model 59 Configuration Chart—Dim Level and Remote Input Parameters

When the dim button is pressed, press these buttons to select the dim level.

These LEDs display the status of remote control input 1. LED 1 lit means that the input is disabled. LED 2 lit means that the input provides a remote mute all function. LED 3 lit means that the input provides a remote dim function. Use the buttons to change modes.

These LEDs display the status of remote control input 2. LED 4 lit means that the input is disabled. LED 5 lit means that the input provides a remote insert 1 function. LED 6 lit means that the input provides a remote insert 2 function. Use the buttons to change modes.

These LEDs display the status of the remote level control input. LED 7 lit means that the remote level control input is disabled. LED 8 lit means that the remote level control input is enabled. Use the button to change modes.

When the dim button is pressed, the LEDs display the selected dim level:

LED 1 lit means 25dB dim; LED 2 lit means 20dB dim; LED 3 lit means 15dB dim; LED 4 lit means 10dB dim.

Default: 20dB dim level, remote control inputs 1 and 2 disabled, remote level control input disabled.

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Press and hold the dim button to display and select the dim level and remote input parameters.

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Model 59 Configuration Chart—Restore Factory Defaults

Press and hold both insert buttons for 5 seconds for the Model 59 to restore its factory defaults. Once defaults have been restored, both insert LEDs will light until the buttons are released.

Factory Defaults: All eight possible input sources are active for each input.

All eight output channels will be active. All channels associated with both inserts are in mode 3, return audio replaces normal audio. A or B output mode. Fully attenuated (minimum) output level. 20dB dim level, remote control inputs 1 and 2 disabled, remote level control input disabled.

Note: The 5-second delay is a safety feature, ensuring that the factory defaults will not be accidently restored.

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Operation

Now that you’ve installed and configured the system, you’re ready to go. You should find operation very easy.

Model 58 Central Controller

The Model 58 front panel contains two LEDs. The power LED should be lit whenever AC mains power is connected. The data LED will light whenever a MIDI system-exclusive message matching the Model 58’s configuration is received. With multiple Model 58s installed, you’ll notice that sometimes all the data LEDs will light simultaneously, and sometimes they’ll light independently. The patterns you’ll see are simply in response to the commands coming from the Model 59. If an operator presses the mute all button, the command generated is applicable to all Model 58s, so all the data LEDs will light. If an operator “solos” an individual channel, only one Model 58 will respond to the command.

Model 59 Control Console

The StudioComm for Surround functions are controlled using the Model 59 Control Console and, if installed, the remote contacts and level control. To make things easy to describe, we’ve divided the StudioComm for Surround functions into five main groups: input source selection, inserts, monitor output general functions, mute/solo, and remote controls.

Input Source Selection

Input source selection is simple. To select an input source for routing to the meter and monitor outputs, press one of the four input source buttons. The corresponding LED will light to let you know that the input

has been selected. You can select more than one input source simultaneously; up to all four. The selected inputs will be summed (combined). Start by pressing and holding the button associated with your first input source. While the button is still pressed, add the extra inputs by momentarily pressing the buttons associated with them. The LEDs will light to tell you which inputs have been selected.

A special configuration mode allows an input to be disabled. This would be appropriate if an input has not been connected to an audio source. If you press an input source button and the current source does not change, the input has been disabled.

Inserts

Activating the two insert sections is as simple as pressing the insert buttons. When an insert function is active, its associated LED will be lit. Because of the flexibility that is built into the insert functions it may be important for an operator to understand how they are configured. An insert may be configured to operate in the usual manner (adding a processing device into the audio path) or may be used for another summing, routing, or muting function.

In some cases, an insert section may have been connected and configured to work in conjunction with an audio console’s AFL/ solo function. If this is the case, pressing the insert button will result in no action occurring. However, when the AFL/solo function is active, the insert LED will flash, as will the remote activity LED.

A special configuration mode allows the inserts to be disabled. This would be appropriate if one or both the insert sections were not going to be used. In this

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case, pressing an insert button would result in no action.

Monitor Output General Functions

Four buttons and one rotary control are associated with the monitor output function. The buttons are A/B output select, reference level, mute all, and dim. The rotary level control is used to set the monitor output level.

A/B Output Select

The A/B button is used to select the set of monitor outputs to be connected to the Model 58’s output circuitry. Two LEDs are associated with the button, displaying the active output. Pressing the button “toggles” between the A and B outputs. There is a special configuration that allows this button to be disabled. This would be appropriate if connections were made only to output A. If this configuration has been selected, pressing the A/B will result in no action occurring.

Reference Level

The reference level button, labeled REF, sets the monitor output to a preset level. This level is normally set by a technician, using a sound-pressure-level (SPL) meter, at the time of installation. The LED associated with the reference level function lights steadily whenever the function is active. When reference level mode is active the rotary level control is disabled, as is the remote level control if it is connected.

The reference LED also serves as a calibration aid. If the reference level mode is not active, and the rotary level control is set at precisely the same level as that stored for the reference value, the LED will flash. This also holds true for the remote level control, if configured.

Mute All

The mute all function is highly complicated to operate—not! Pressing the mute all button causes the active outputs (A or B) to mute using the output relays. The LED associated with the mute all button will flash whenever mute all is active. This would also hold true if mute all is enabled via the remote mute all function. In this case the mute all LED would flash, along with the remote activity LED.

Turning on the mute all function causes the current operating status to be saved in the Model 59’s memory. Upon turning off mute all, the operating status is returned to its previous state. This applies specifically to the mute/solo, monitor level, and dim functions.

Dim

The dim function is quite self-explanatory. Press the dim button to enable the dim mode, which will reduce the monitor output level by a preset amount. The dim button is always set to “latch” the function on and off. Dim activity applies no matter whether the level is being set by the rotary control, the reference button, or, if configured, the remote level control. The dim level can be configured for 10, 15, or 20dB, so one of those values will apply when dim is active. The LED associated with the dim button will flash whenever dim is active. This would also hold true if dim is enabled via the remote dim function. In this case the dim LED would flash, along with the remote activity LED.

What’s not so self-explanatory is the autodim-off function. Whenever dim is on and reference mode is not active, changing the rotary level control or, if configured, the remote level control, will automatically turn

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off dim. The auto dim off function is a unique attempt at protecting the health of audio engineers. No longer will there be a heart-stopping blast of audio when the dim button is pressed to turn dim on, but it actually turns it off because dim was already active. It’s hard to explain unless you’ve used an audio console and experienced this in person—trust us, this situation does happen! Auto dim off is a wonderful “real-world” function.

Note that the auto dim off function is not active whenever dim is on due to the remote dim function being active. This allows remote control equipment, such as a talk-back system, to reliably dim the monitor outputs.

Rotary Level Control

The rotary level control is used to manually adjust the monitor output level. It is active any time the reference level function is not active. When the rotary level control is set to give the same output level as the preset reference level, the reference LED will flash. Note that when the level control is set to its fully counterclockwise position, maximum attenuation is achieved, but not a full mute. The mute all button should be used to fully mute the monitor outputs.

The rotary level control and, if configured, the remote level control work together in an interesting fashion. The control which is turned last sets the monitor output level. This makes it very simple to move from using one control to the other, with no remote enable/disable buttons or switches to activate.

As a visual aid, if the level is changed using the remote level control, the remote activity LED on the Model 59 flashes. The LED continues to flash until a level-related

parameter on the Model 59 changes; the rotary level control is turned, or the reference level, mute all, or dim function is enabled. The remote activity LED flashes in this manner so that an operator doesn’t wonder why the level has changed “mysteriously.” A change in monitor level can have serious consequences to an audio mix, so this LED serves as an alert that something has changed. Remember, if you are worried about the monitor level being changed remotely during an important mix, use the reference level function to “lock out” the local and remote level controls.

Mute/Solo

The mute/solo mode button and the eight output channel buttons, along with associated LEDs, work together to provide excellent flexibility. The mute/solo mode switch allows the user to select between industrystandard mute and solo functions. The mute and solo functions use the mute relays in the Model 58 units to enable or disable output channels. Going from mute to solo mode, or vice-versa, clears all active mutes or solos. Pressing the mode switch twice is a legitimate means of quickly clearing muted or soloed channels.

In the mute mode, multiple channels can be muted simultaneously. A channel that is muted has its associated LED turned off. In the solo mode multiple channels can be soloed simultaneously. A channel that is soloed has its associated LED flash.

Note that output channels which have been configured to be disabled are not accessible using the output channel buttons. This ensures that a 6-channel StudioComm for Surround system doesn’t have output channel buttons 7 and 8 available for access. This also ensures

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that an operator has access to only the available channels. Unsupported channels will have their LEDs permanently off.

Technical Notes

Monitor Output Gain Structure

The Model 58 Central Controller’s monitor outputs are configured for unity gain. When the rotary level control on the Model 59 Control Console is set for maximum level (fully clockwise) the output level is the same as the input level. Trim potentiometers allow precise adjustment of the monitor output level. This was provided so that slight level variations caused by the Model 58’s circuitry and the associated power amplifiers could be “trimmed out.”

Linking Multiple Model 58 Units

Included with each Model 58/Model 59 base configuration is a bus assembly that includes four 9-pin D-sub plugs (males). This allows the interconnection of up to four Model 58 units, creating, in the usual configuration, an 8-channel monitoring system. Should a special application require the interconnection of more than four Model 58s, there is no problem in creating a custom bus assembly. All pins of the 9-pin D-subs are simply connected one-to-one. There is no practical limit to the number of D-subs that can be part of the bus assembly.

If rack space or other considerations prevent the Model 58 units from being directly adjacent to each other, there is no problem creating an extended bus assembly. Note also that the two 9-pin D-subs on the Model 58 are internally connected in parallel. Clarity for the user is the only reason that the connectors are labeled differently. This means that a bus

assembly, such as provided by Studio Technologies, isn’t the only means of interconnecting Model 58s. Individual 9-pin to 9-pin D-sub cables can be used to link Model 58s, utilizing both the to/from control console and loop thru connectors.

Input and Output Levels

The inputs, inserts, and outputs were designed for a +4dBu nominal operating level. It was anticipated that signals with lower operating levels may also get connected. While it was not practical to directly support multiple operating levels the circuitry was specifically designed so that operating level changes could easily be performed by a qualified technician. The Model 58/Model 59 Service Guide, available upon request from the factory, has complete schematic diagrams. Checking the “fine print” on the Model 58 schematic pages, you’ll find the resistor identification numbers and corresponding values to change the input nominal level to –10dBu operation. (The Model 58’s designer is well aware that “–10” signals are supposed to be referenced to dBV, but finds from experience that a nominal level of –10dBu interfaces better!)

Definition of Level—dBu

Whenever possible, Studio Technologies has opted to use the dBu designation as it seems to be quite rational. Using dBm was fine when all audio line outputs were terminated with 600 ohm loads. In this way it was easy to say that 0dBm is 1 milliwatt dissipated in the known load (i.e., 0dBm across 600 ohms will measure 0.775V). In contemporary situations an output is rarely terminated with 600 ohms; generally 10k ohms or higher. The dBu designation is better because it refers to dB referenced to 0.775V, with no reference to load

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impedance. This takes into account today’s audio scene where signals have a low source impedance, and a high input impedance. The dBu designation is becoming the standard for the professional audio industry.

“Hot” Disconnection of the Model 59 Control Console

Should you need to relocate the Model 59 while your StudioComm for Surround system is operating, there is no reason why you can’t disconnect the cable, move the unit, and then connect it again. If the Model 59 is disconnected while it is operating, the current operating parameters are saved in nonvolatile memory and the Model 58 Central Controllers will continue to operate as they were when the link was broken. No clicks, pops, or other noises will occur when the Model 59 is again connected. The Model 59 will go through its standard power-up sequence, send a message to reset power-up defaults, then send the operating parameters as stored in its memory. You may notice a brief interval of silence while the Model 58s respond to the reset defaults and operating parameter messages.

amplifiers have controls on their inputs to allow easy adjustment of the input sensitivity.

Monitor Output Transient Protection

The Model 58 Central Controller contains a power up/power down transient protection feature. This limits the chance of damage to the monitor loudspeakers during the time when AC mains voltage is connected, disconnected, or has significantly changed from nominal. A combination of hardware and software is used to monitor one of the power supply “rails.” Until the power supply exceeds 81% of its nominal voltage, electromechanical relays maintain a short circuit condition on the A and B outputs. After a short delay the relays are allowed to function normally. Whenever the power supply drops below 79% of its nominal voltage, the relays immediately go to their mute state. During testing it was found that upon power up the outputs remained very quiet; during power down a moderate “tick” was the worst that was heard.

Power Amplifier Input Sensitivity

Optimum StudioComm for Surround performance is obtained when the input sensitivity of the associated audio power amplifiers are adjusted to match the Model 58s monitor output level. With normal, but loud, listening levels you should find the level potentiometer on the Model 59 set to about the “2-’clock” position. If you find that you don’t have to turn up the Model 59’s control that high, reduce the input sensitivity of the power amplifiers until you get to the 2-o’clock position. Most power

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Specifications

Model 58 Central Controller

General Audio: Frequency Response: 20Hz-20kHz ±0.1dB

(down 1dB @ 85kHz), monitor out Distortion (THD+N): 0.01%, measured at 1kHz,

+4dBu, monitor out

S/N Ratio: 89dB, ref +4dBu out Crosstalk: 78dB, ref +4dBu in

for Surround

AC Mains Requirement:

100, 120, or 220/240V, ±10%, factory configured, 50/60Hz

Dimensions (Overall):

19.00 inches wide (48.3cm)

1.72 inches high (4.4cm)

8.75 inches deep (22.2cm) (1 standard rack space)

Weight: 8.0 pounds (3.6kg)

Model 59 Control Console

Audio Inputs: 8 (four 2-channel pairs) Type: electronically balanced Impedance: 24k ohms Nominal Level: +4dBu, adjustable ±2dB

Inserts: 2, 2-channel Send Type: electronically balanced Send Nominal Level: +4dBu Send Maximum Level: +27dBu into 10k ohms,

+26dBu into 600 ohms

Return Type: electronically balanced Return Impedance: 24k ohms Return Nominal Level: +4dBu, adjustable ±2dB

Monitor Outputs: 2, 2-channel Type: electronically balanced A/B Switching: sealed, electromechanical relays,

output circuitry shared by both outputs

Nominal Level: unity gain, adjustable ±2dB Maximum Output Level: +27dBu into 10k ohms,

+26dBu into 600 ohms

Application: supports up to four Model 58 Central Controllers. (Special mode supports up to eight Model 58s.)

Power: provided by Model 58 units Output Data: generates MIDI system-exclusive

messages Remote Control Inputs: 2 contact, 1 potentiom-

eter

Connector: 1, 9-pin D-subminiature female Dimensions (Overall):

7.2 inches wide (18.3cm)

2.2 inches high (5.6cm)

5.4 inches deep (13.7cm) Weight: 2.0 pounds (0.9kg)

Specifications subject to change without notice.

Meter Output: 1, 2-channel Type: unbalanced Nominal Level: +4dBu Maximum Level: +21dBu into 10k ohms, +20dBu

into 600 ohms

Connectors: Audio: 3, 25-pin D-subminiature female Control: 2, 9-pin D-subminiature female AC Mains: 3-blade IEC-type

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Appendix A

Controlling the Model 58

The Model 58 Central Controller uses MIDI system-exclusive messages to control all functions. The Model 59 Control Console is programmed to generate a subset of what the Model 58 is capable of doing. By using standard MIDI messages, the Model 58 can be used for a wide range of special applications. Any device that can be programmed to send system-exclusive MIDI messages can be used to control the Model 58.

While it is perfectly acceptable for devices other than the Model 59 Control Console to generate the MIDI system-exclusive codes to “drive” the Model 58 Central Controller units, a hardware detail must be noted. The architecture of the Model 58 was created so that up to 8 units could be connected together. A standard MIDI hardware implementation would not allow an output to drive this number of inputs. To solve this problem the input impedance of the Model 58’s MIDI input was raised from the normal 220 ohms to 2000 ohms, while on the Model 59 a more sophisticated output circuit was implemented. The output circuit is essentially a current source that can easily drive up to eight of the modified inputs.

the Model 59’s output circuit, which consists of a few low-cost components. Alternately, the Model 58’s MIDI input impedance can be changed to 220 ohms by simply changing one resistor. This will again limit the number of Model 58 units that can be driven by a standard MIDI output, but three or four should function correctly. Schematic diagrams, included as part of the Service Guide, are available to purchasers of StudioComm for Surround systems. Contact the factory for details.

General Notes:

All MIDI messages to be acted upon are system-exclusive type (F0H). No channel mode, system common, or system real time messages are utilized.

Studio Technologies, Inc. manufacturer’s ID number is 00H 00H 56H

The Model 58’s product device ID number is 03H.

From our very limited tests, connecting one or two Model 58 units to a standard MIDI output works correctly. However, connecting more than one or two will not work reliably, or at all. Several solutions to this problem are available. A custom hardware implementation can duplicate

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Function: Reset to Power Up Default Configuration

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 00H Function, Restore Power Up Default Configuration 7 F7H EOX, End of System Exclusive

Notes: Action taken after message is received:

Set all input sources to off. Set all output channels to off. Set output level to minimum. Set Output A/B status to both off. Set Insert 1 status to all normal. Set Insert 2 status to all normal.

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Function: Input Source and Associated Channels

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 01H Function, Input Source and Associated Channels 7 0nH Input Source, range 1-8, 1=input source 1, 2=input source 2, etc. 8 nnH Input Channel Status Bit Map (sum values from all seven channels):

Channel 1: off=00; on=01 Channel 2: off=00; on=02 Channel 3: off=00; on=04 Channel 4: off=00; on=08 Channel 5: off=00; on=10 Channel 6: off=00; on=20 Channel 7: off=00; on=40

9 0nH Input Channel Status

Channel 8: off=0; on=1

10 F7H EOX, End of System Exclusive

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Function: Output Channel Status

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 02H Function, Output Channel Status 7 nnH Output Channel Status Bit Map (sum values from all seven channels):

Channel 1: off=00; on=01 Channel 2: off=00; on=02 Channel 3: off=00; on=04 Channel 4: off=00; on=08 Channel 5: off=00; on=10 Channel 6: off=00; on=20 Channel 7: off=00; on=40

8 0nH Output Channel Status

Channel 8: off=0; on=1

9 F7H EOX, End of System Exclusive

Note: Mute all function is implemented using the output enable command, not the output

channel status command

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Function: Output Level - Normal

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 03H Function, Output Level - Normal 7 nnH Output Level, MSB, range 00-7F 8 0nH Output Level, LSB, range 0-1 9 F7H EOX, End of System Exclusive

Notes: Control console sends new value each time output level is changed.

Output level is 8-bit precision, spread over two MIDI bytes: 00H 00H lowest; 7FH 01H highest. MIDI byte 7 is output level bits 2-8; MIDI byte 8 is output level bit 1.

Dim function is performed by control console and is sent using output level command.

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Function: Output Level - Reverse

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 04H Function, Output Level - Reverse 7 nnH Output Level, MSB, range 00-7F 8 0nH Output Level, LSB, range 0-1 9 F7H EOX, End of System Exclusive

Notes: Not sent by control console. Provided for special applications.

Output level is 8-bit precision, spread over two MIDI bytes: 00H 00H highest; 7FH 01H lowest. MIDI byte 7 is output level bits 2-8; MIDI byte 8 is output level bit 1.

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Function: Output A/B Status

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 05H Function, Output A/B Status 7 0nH Output A/B Bit Map (sum values from both channels):

Output A: off=0; on=1 Output B: off=0; on=2

8 F7H EOX, End of System Exclusive

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Function: Insert 1 Status

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 06H Function, Insert 1 Status 7 nnH Insert Bit Map (sum values from all three channels):

Channel 1: mute=00; normal=01; replace=02; sum=03 Channel 2: mute=00; normal=04; replace=08; sum=0C Channel 3: mute=00; normal=10; replace=20; sum=30

8 nnH Insert Bit Map (sum values from all three channels):

Channel 4: mute=00; normal=01; replace=02; sum=03 Channel 5: mute=00; normal=04; replace=08; sum=0C Channel 6: mute=00; normal=10; replace=20; sum=30

9 nnH Insert Bit Map (sum values from both channels):

Channel 7: mute=00; normal=01; replace=02; sum=03 Channel 8: mute=00; normal=04; replace=08; sum=0C

10 F7H EOX, End of System Exclusive

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Function: Insert 2 Status

Byte Value Description 1 F0 H System-Exclusive Message

2 00H 1 3 00H 2 4 56H 3

Byte of Studio Tech ID

Byte of Studio Tech ID 5 03H Product ID (Model 58) 6 07H Function, Insert 2 Status 7 nnH Insert Bit Map (sum values from all three channels):

Channel 1: mute=00; normal=01; replace=02; sum=03 Channel 2: mute=00; normal=04; replace=08; sum=0C Channel 3: mute=00; normal=10; replace=20; sum=30

8 nnH Insert Bit Map (sum values from all three channels):

Channel 4: mute=00; normal=01; replace=02; sum=03 Channel 5: mute=00; normal=04; replace=08; sum=0C Channel 6: mute=00; normal=10; replace=20; sum=30

9 nnH Insert Bit Map (sum values from both channels):

Channel 7: mute=00; normal=01; replace=02; sum=03 Channel 8: mute=00; normal=04; replace=08; sum=0C

10 F7H EOX, End of System Exclusive

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Appendix B

Model 58 Single-Channel Mode

DIP switch 5 on the Model 58’s front panel allows the operating mode to be set. Installations that utilize a Model 59 Control Console will use the two-channel mode, configured by setting DIP switch 5 to the down (off) position. In this mode, a Model 58 supports two output channels and four 2-channel input pairs. Special applications can use the Model 58’s single-channel operating mode, configured by setting DIP switch 5 to the on (up) position. Figures 12, 13, and 14 provide detailed connection information on the input, outputs, and inserts when a Model 58 is operating in the single-channel mode.

units. During 1998 Studio Technologies’ expects to release an additional control console unit to support automatic direct/ play switching for film sound applications. (Some of you may know this as PEC/direct monitoring.) It is also anticipated that custom installations will be created that generate MIDI system-exclusive messages to “drive” Model 58 units. Contact the factory for additional information.

Signal Signal

Connections High (+) Low (–) Shield

IN 1241225 IN 2102311 IN 3 21 9 22 IN 4 7 20 8 IN 5 18 6 19 IN 6 4 17 5 IN 7 15 3 16

IN 8 1 14 2

The concept of the single-channel mode is simple: The signal flow is organized so that any of the eight inputs can be routed to one output. (This is in contrast to the two-channel mode where the eight inputs are organized as four pairs.) In the singlechannel mode, a maximum of four of the 8 inputs can be simultaneously routed to one output channel. Specifically, monitor output 1 (A and B), meter output 1, insert 1/channel 1, insert 2/ channel 2 are active in the single-channel mode. Monitor output 2 (A and B), meter output 2, insert 1/ channel 2, and insert 2/channel 2 are disabled.

It is expected that a number of applications for the single-channel mode will arise. A special version of the Model 59 Control Console can be created at the factory to allow up to eight 8-channel sources to be connected to eight Model 58

Notes: 1) Connector type on Model 58 is 25-pin D-subminiature

female. Installer must provide plug (male). Connector uses 4-40 threaded inserts for locking with mating plug.

2) Wiring scheme follows Tascam DA-88 convention. Standard DA-88-type wiring harnesses are directly compatible, with the exception of 4-40 screw threads being required.

Figure 12. Single-Channel Mode Connector Pin Out for Inputs

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Signal Signal

Connections High (+) Low (–) Shield

MONITOR A 24 12 2 5

NOT USED 10 23 1 1

MONITOR B 21 9 22

NOT USED 7 20 8

METER 18 6 (See Note 3) 19 NOT USED 4 17 (See Note 3) 5 NOT USED 15 3 16

NOT USED 1 14 2

Notes: 1) Connector type on Model 58 is 25-pin D-subminiature

female. Installer must provide plug (male). Connector uses 4-40 threaded inserts for locking with mating plug.

2) Wiring scheme loosely follows Tascam DA-88 convention. Modified DA-88-type wiring harnesses are required, along with 4-40 screw threads.

3) Meter outputs are unbalanced. Pins 6 and 17 internally connected to Model 58 shield.

Figure 13. Single-Channel Mode Connector Pin Out for Outputs

Signal Signal

Connections High (+) Low (–) Shield

SEND 1-1 24 12 2 5

RETURN 1-1 1 0 2 3 1 1

SEND 1-2 21 9 22

RETURN 1-2 7 20 8

NOT USED 18 6 19 NOT USED 4 17 5 NOT USED 15 3 16 NOT USED 1 14 2

Notes: 1) Connector type on Model 58 is 25-pin D-subminiature

female. Installer must provide plug (male). Connector uses 4-40 threaded inserts for locking with mating plug.

2) Wiring scheme loosely follows Tascam DA-88 convention. Modified DA-88-type wiring harnesses are

required, along with 4-40 screw threads.

Figure 14. Single-Channel Mode Connector Pin Out for Inserts

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Studio Technologies 58 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual