Model 58 Single-Channel Mode.............................. 5 2
Appendix C
Block Diagrams
Model 58 Central Controller
Model 59 Control Console
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Issue 2, April 1998Model 58/59 User Guide
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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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Issue 2, April 1998Model 58/59 User Guide
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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
Model 58/59 User GuideIssue 2, April 1998
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for Surround
“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
Issue 2, April 1998Model 58/59 User Guide
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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.
Model 58/59 User GuideIssue 2, April 1998
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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
Model 58/59 User GuideIssue 2, April 1998
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for Surround
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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for Surround
(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
Issue 2, April 1998Model 58/59 User Guide
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for Surround
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
Model 58/59 User GuideIssue 2, April 1998
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for Surround
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
SignalSignal
ConnectionHigh (+)Low (–)Shield
IN 1-1241225
IN 1-2102311
IN 2-121922
IN 2-27208
IN 3-118619
IN 3-24175
IN 4-115316
IN 4-21142
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
Issue 2, April 1998Model 58/59 User Guide
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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.
METER 2417 (See Note 3)5
NOT USED15316
NOT USED1142
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
Model 58/59 User GuideIssue 2, April 1998
Studio Technologies, Inc.Page 17
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