BOSE AMPLUS SUPPLEMENT S2 Schematic

CONTENTS

Safety Information............................................................................................................................ 3

Electrostatic Discharge Sensitive (ESDS) Device Handling ........................................................ 4

Warranty Information....................................................................................................................... 4

Theory of Operation, Opti-Voice

Theory of Operation, Opti-Source™ Option Card...................................................................... 7-8

Theory of Operation, FreeSpace

General Information ....................................................................................................................... 10

Disassembly/Assembly Procedures ....................................................................................... 11-12

Figure 1. AmPlus™ 100 Rear Panel .............................................................................................. 11

Figure 2. Option Card Installation .................................................................................................. 11

Figure 3. Top Cover Removal ........................................................................................................ 11

Figure 4. EQ Card Installation........................................................................................................ 11

Figure 5. Top Cover Replacement ................................................................................................. 12

Opti-Voice Page Option Card Controls ................................................................................... 13-15

Opti-Source Option Card Controls ..........................................................................................16-18

AmPlus 100 Test Setup Parameters ............................................................................................. 19

Table 1. AmPlus 100 Initial Switch Settings ................................................................................... 19

Table 2. AmPlus 100 Signal Inputs Table ....................................................................................... 19

Table 3. AmPlus 100 Signal Outputs Table .................................................................................... 19

Test Procedures ........................................................................................................................ 20-31

Table 4. Opti-Source Option Card Initial Switch Positions ............................................................. 20

Table 5. Opti-Source Option Card Signal Inputs ............................................................................ 20

Table 6. Opti-Voice Page Option Card Initial Switch Positions....................................................... 24

Table 7. Opti-Voice Page Option Card Signal Inputs ..................................................................... 24

Table 8. Opti-Voice Page Option Card Signal Outputs................................................................... 24

Table 9. AmPlus 100 Amplifier Initial Switch Settings..................................................................... 28

Table 10. AmPlus 50 Amplifier Initial Switch Settings..................................................................... 28

Table 12. FreeSpace Model 1B Flush EQ Frequency Response Tests ......................................... 29

Table 11. FreeSpace Model 1B Surface EQ Frequency Response Tests...................................... 29

Table 13. Model 8 Full Range Response Tests.............................................................................. 30

Table 14. Model 8 High Frequency Response Tests...................................................................... 31

Table 15. Model 25/32 Full Range Response Tests....................................................................... 31

Table 16. Model 25/32 High Frequency Response Tests............................................................... 31

Part List Notes................................................................................................................................ 32

Product Code Listing..................................................................................................................... 32

Electrical Part List, Opti-Voice Page Card .............................................................................. 33-35

Packing List, Opti-Voice Page Card (see Figure 6) ..................................................................... 36

Figure 6. Opti-Voice Page Card Packing View............................................................................... 36

Electrical Part List, Opti-Source Option Card ........................................................................ 37-39

Packing List, Opti-Source Option Card (see Figure 7) ............................................................... 39

Figure 7. Opti-Source Option Card Packing View.......................................................................... 39

FreeSpace Model 1B EQ Card Part List .................................................................................. 40-41

Packing List, FreeSpace Model 1B EQ card (see Figure 8) ...................................................... 41

Figure 8. FreeSpace Model 1B EQ Card Packing View................................................................. 41

Model 8 EQ Card Part List ........................................................................................................ 42-43

Packing List, Model 8 EQ Card (see Figure 9)............................................................................. 43

Figure 9. Model 8 Equalizer PCB Packing View ............................................................................ 43

Model 25/32 EQ Card Part List ................................................................................................. 44-45

Packing List, Model 25/32 EQ Card (see Figure 10).................................................................... 45

Figure 10. Model 25/32 Equalizer PCB Packing View ................................................................... 45

Page Option Card ................................................................. 5-6

Model 1B Equalizer Card........................................................ 9

CONTENTS

Note: This document has been updated with information from supplement 194101-S3. This affects part numbers for the switches used on the Opti-Voice Page card and the Opti-Source Option card. Refer to supplement 194101-S3 for more information.

Main Part List, FreeSpace

Zone 2 Remote Control with A/B Switch (see Figure 11) ............. 46

Figure 11. FreeSpace Zone 2 Remote Control with A/B Switch Exploded View............................ 46

Main Part list, FreeSpace Zone 2 Remote Volume Control w/o A/B Switch (see Figure 12) ... 47

Figure 12. FreeSpace Zone 2 Remote Volume Control w/o A/B Switch Exploded View ............... 47

Integrated Circuit Pinout Diagrams......................................................................................... 48-49

General Troubleshooting Tips ................................................................................................. 50-51

Troubleshooting the Opti-Voice

Page Card................................................................................ 52

Troubleshooting the Opti-Source™ Option Card........................................................................ 53

Figure 13. FreeSpace Model 1B Equalizer Board Topside and Etch Layout Diagram................... 54

Figure 14. FreeSpace Model 1B Equalizer Board SMD and Etch Layout Diagram ....................... 54

Figure 15. Models 8 and 25/32 Equalizer PCB Topside Component and Etch Layout Diagram ... 55

Figure 16. Models 8 and 25/32 SMD Component and Etch Layout Diagram ................................ 55

Figure 17. Models 8 and 25/32 Equalizer PCB Schematic Diagram.............................................. 56

CAUTION: The AmPlus™ 100 and AmPlus 50 Amplifier Option and Equalizer Cards contain no user serviceable parts. To prevent warranty infractions, refer servicing to warranty service centers or factory service.

PROPRIETARY INFORMATION

THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF

BOSE

CORPORATION WHICH IS BEING FURNISHED ONLY

FOR THE PURPOSE OF SERVICING THE IDENTIFIED BOSE

PRODUCT BY AN AUTHORIZED BOSE SERVICE CENTER OR

OWNER OF THE BOSE PRODUCT, AND SHALL NOT BE

REPRODUCED OR USED FOR ANY OTHER PURPOSE.

SAFETY INFORMATION

1. Parts that have special safety characteristics are identified by the symbol on schematics or by special notes on the parts list. Use only replacement parts that have critical characteristics recommended by the manufacturer.

2. Make leakage current or resistance measurements to determine that exposed parts are acceptably insulated from the supply circuit before returning the unit to the customer. Use the following checks to perform these measurements:

A. Leakage Current Hot Check

(1) With the unit completely reassembled, plug the AC line cord directly

into a 120V AC outlet. Do not use an isolation transformer during this test. Use a leakage current tester or a metering system that

complies with American National Standards Institute (ANSI) C101.1

"Leakage Current for Appliances" and Underwriters Laboratories (UL) 1492 (71).

(2) With the unit AC switch first in the ON position and then in the OFF position,

measure from a known earth ground (metal water pipe, conduit, etc.) to all exposed metal parts of the unit (antennas, handle bracket, metal cabinet, screwheads, metallic overlays, control shafts, etc.), especially any

exposed metal parts that offer an electrical return path to the chassis. (3) Any current measured must not exceed 0.5 milliamp. (4) Reverse the unit power cord plug in the outlet and repeat test.

ANY MEASUREMENTS NOT WITHIN THE LIMITS SPECIFIED HEREIN INDICATE A POTENTIAL SHOCK HAZARD THAT MUST BE ELIMINATED BEFORE RETURNING THE UNIT TO THE CUSTOMER.

B. Insulation Resistance Test Cold Check (1) Unplug the power supply and connect a jumper wire between the two

prongs of the plug. (2) Turn on the power switch of the unit. (3) Measure the resistance with an ohmmeter between the jumpered AC plug

and each exposed metallic cabinet part on the unit. When the exposed

metallic part has a return path to the chassis, the reading should be

between 1 and 5.2 Megohms. When there is no return path to the chassis,

the reading must be "infinite". If it is not within the limits specified, there is the possibility of a shock hazard, and the unit must be repaired and rechecked before it is returned to the customer.

ELECTROSTATIC DISCHARGE SENSITIVE

(ESDS) DEVICE HANDLING

This unit contains ESDS devices. We recommend the following precautions when repairing, replacing, or transporting ESDS devices:

• Perform work at an electrically grounded work station.

• Wear wrist straps that connect to the station or heel straps that connect to conductive floor

mats.

• Avoid touching the leads or contacts of ESDS devices or PC boards even if properly

grounded. Handle boards by the edges only.

• Transport or store ESDS devices in ESD protective bags, bins, or totes. Do not insert

unprotected devices into materials such as plastic, polystyrene foam, clear plastic bags, bubble wrap, or plastic trays.

WARRANTY INFORMATION

The following products are covered by a 5-year transferable limited warranty.

• Opti-Voice

• Opti-Source™ Option Card

• FreeSpace

• Model 8 Equalizer PCB

• Model 25/32 Equalizer PCB

Page Option Card

Model 1B Equalizer Card

THEORY OF OPERATION

Opti-Voice® Page Option Card

Introduction

This card accepts a pair of mic or line level sources at its Page 1 and Page 2 inputs at J1. These signals are amplified in three variable gain stages, passed through a muting circuit, and presented to a line out source selector. The page signals are also mixed with the signals fed to the Page option card from the AmPlus™ 100 and fed back into the AmPlus 100.

Sheet 1 of 2

Refer to the Opti-Voice Page Option Card schematic diagram, sheet 1 of 2 for the following information.

Note: The designators inside the brackets “[ ]” are the schematic grid coordinates which are provided in order to make it easier to locate components on the schematic sheet indicated in the description.

The Page 1 and Page 2 inputs at J1 [B/C8] accept any source from mic to line level sources. U100A [D7], and U100B [A7] are differential input amplifiers, with inputs well protected against RF and ESD, and with gain selectable between 0 and +30dB by switches S1 [C7], and S2 [A7]. The amplified page signals pass through U101B [D7], and U102B [A6], stages with gain controllable between 0 and +20dB by R1 [D6], and R2 [A6]. After this stage, S3 [D5], and S4 [B5] select whether the page signals pass through another adjustable gain stage (U101A, U102A) or through a limiter. The adjustable gain stage can range between -20 and +10dB, controlled by R1, 2. If the page signal is routed through the limiter, the limiter can automatically control the gain, from -20 to +10dB, in response to the signal level coming in. The compressor is implemented with U106 [C6], U103C [C6], and U104C [B6]. U106 has a current in/current out gain cell providing negative feedback around the op amps. The gain cell is controlled by an internal level detector circuit which monitors the signal applied to the limiter. Once the input signal has risen beyond the threshold, the detector reduces the stage gain with a slope of nearly 1dB/1dB, holding the output level nearly constant over a 30dB variation in input level.

Op amps U103A, B [C5] and U104A, B [B5] watch the highest of the signal levels out of the first two gains stages and the compressor itself. They also watch the voltage on the compressor release capacitors. Ultimately, they drive a bi-color LED, D104[C4], and D105 [B5]. When the compressor is active, the LED glows green and brightens as the signal level and compressor action rise. If the level out of the compressor or one of the gain stages approaches its linear limits, the LED changes to red to warn the installer that the source gain has been set too high.

After the limiter, S3, 4 feed the signal into a page mute circuit. Connected to the junction of two input resistors of the inverting gain stages U105A [D5], is a transistor pair, Q100, 101 [C5]. The same circuit is used for the other channel with U105B [A4] with transistors Q102, 103 [A4]. When these transistors are turned on, they attenuate the page signal, essentially turning it off. The transistors are controlled by the voltages PG MUTE1, 2, which are developed by the page trigger circuits. The page trigger circuits begin with a trigger level control, R3 [B3], and R4 [B2] which feeds the page signal through an amplifier and half wave rectifier and comparator (U202C, D, [B2/3] and U202A, B [B2]). Signals greater than about 0.8 volts trigger the comparator, turning on the Page Trigger Indicator LED D104 [B1] and D105 [B1], setting VPG1, 2 [B1] high, and raising PG MUTE1 [A1], and PG MUTE2 [B1]. Raising PG MUTE1, 2 disables the page mute transistor, allowing the page signal to pass.

THEORY OF OPERATION

Opti-Voice® Page Option Card

Sheet 1 of 2 (continued)

After the page mute circuits, the page signals take two paths. One path is into U200 [D3], U201 [C3], selector switches which can be DIP switch programmed to select among music, page 1, page 2, and page 1 + page 2 signals (see chart on schematic). The selected signals are passed through a buffer amplifier, U203A [C2], and U203B [D2] to the Page Card line outputs at J3 [C1] (protected against EMC and ESD by the associated resistors and capacitors). The second path takes the outputs from Page 1 [D1] and Page 2 [A3] to Sheet 2.

Sheet 2 of 2

Refer to the Opti-Voice Page Option Card schematic diagram, Sheet 2 of 2 for the following information.

The two page signals entering Sheet 2 are passed through Page 1, 2 [C8] Level Trim Potentiometers R5, 6 [C8] and through U300 [C6], a 4 PST analog switch. Logic comprised of U301 [B6] responds to the VPG1, 2 signals [B8] (which indicate that a page signal is active) and looks at the Page Enable Zone Assignment switches (S6) [A7] to decide whether or not U300 will pass the page signal(s) to the output. The selected and active page signals are summed with the music signals in U304A [C4], and U304D [C3]. The music signals are those signals passed into this option card from the AmPlus™ amplifier. Before being summed, these music signals pass through ducker stages, U304B [B/C5], U304C [C4], and U303A [B5], with U303B [C4]. U303A, B is a current controlled transconductance amplifier that provides additional negative feedback around U304B, C when the signals from Q300, 301 [B5] are active. This attenuates the music signal by about 20dB while the page signal is active.

THEORY OF OPERATION

Opti-Source™ Option Card

Introduction

Refer to the Opti-Source Source Option Card schematic diagram, sheet 1 of 2 for the following information.

This card accepts a pair of line level sources at its CH1 and CH2 "B" inputs. It allows automatic or manual selection of the A (supplied by the AmPlus™ 100) or B sources, passes them optionally through a dynamic range compressor, and returns the signal to the AmPlus signal path.

Sheet 1 of 2

The CH1 and CH2 "B" Inputs at J1 [C8] accept line level sources. U1A, B [B/C8] are unity gain, differential input amplifiers, with inputs well protected against RF and ESD. With S3 [B6] in the 2 CH position, each op amp sends its output through a TRIM potentiometer (R1 [C7], and R2 [B6]) into a fade in circuit. When S3 is in the MONO position, the CH1 B input is steered forward to both CH1 and CH2 paths, in mono.

U1C, D and U102A, B [B/C6] constitute a two channel fade in circuit. When S1, 2 [B/C2] are in the AUTO selection mode, circuits on Sheet 2 detect when the sources connected to the A inputs at J1 on the rear of the AmPlus 100 amplifier become active. When A is active, it will override the selection of the B input, turning B off and A on. When A becomes inactive, the fade in circuit slowly fades the B signal back up to full volume and switches from A to B. When S1, 2 are in the manual selection mode, switches external to the AmPlus 100 force selection of the A or B sources, independently for CH1 and CH2, if desired. The fade in circuit incorporates a transconductance amplifier in the feedback path of a non-inverting op amp stage. As long as the currents IABC1 [D1] and IABC2 [A1] into U102 [C6] and [B6] are essentially off, there is only the negative feedback provided by R115 [C6] and R121 [B6], and the stage gains are normal. When IABC ramps up, U102 turns on and provides additional negative feedback, reducing the stage gain by 20 or 30dB, fading the B input.

U200 [C3] and U201 [B3] are selector switches for the CH1 and CH2 A, B signals. The CH1 selector, U200, can select among sources A left (CH1), B left (CH1), A mono (CH1+CH2), and B mono (CH1+CH2). U201 behaves similarly for CH2. J3, A/B REMOTE Connector [C1], accommodates two SPST normally open selector switches (located on the Zone 2 Remote Volume Controls) that can be placed near the system operator to allow manual selection between A and B sources.

THEORY OF OPERATION

Opti-Source™ Option Card

Sheet 2 of 2

Refer to the Opti-Source Source Option Card schematic diagram, sheet 2 of 2 for the following information.

U300 detects signal presence on the CH1 A source, if S1 [sheet 1 at C2] is in the AUTO selection mode. U300A [D8] amplifies the source, while U300B, C [D7] comprise a peak detector whose output goes low when the absolute value of U300A's output exceeds about 1 volt. U300D [D7] provides adjustable time delay and hysteresis for the detector output, which goes high when source activity is detected. This signal, SW1 [D1], passed through D312, moves the signal selector U200 [sheet 1 at C3] to the A source position. U302C, D [D5] provide the final processing needed to make the ramped current drive needed for the fade in circuit on Sheet 1. U302D and Q300 [D5] perform voltage to current conversion. U301 [A8], U302A, B, [A5/6] and Q301 [A5] provide the same function for CH2.

Signals DRC1 [C8] and DRC2 [B8], coming from the source selectors U200 and U201 [B/C3] on Sheet 1, are presented to S4 [C4] and S5 [B5], respectively, so that they can pass through or bypass the dynamic range compressor (U400 [B/C3], U401B [C4], U402C [B3]). IF S4, 5 are set to ENABLE, the selected source is passed through the Dynamic Range Compressor. The DRC provides up to 25dB of gain to low level signals, gradually dropping back to 0dB gain for high level signals. This improves the audibility of low level passages of CD quality, wide dynamic range source material. U400 contains both the level detectors and current in/current out gain cells needed to turn op amps U401B, 402C into a compressor. The compressor output passes through S4 and a buffer stage before being returned to the AmPlus™ 100. Op amps U401C, A [C1/2] watch both the signal level out of the compressor and the voltage on the compressor release capacitors and drive a bi-color LED, D402 [C1]. When the compressor is active, the LED glows green and brightens as the signal level and compressor action rise. If the level out of the compressor approached its linear limits, the LED changes to red to warn the installer that the source gain has been set too high.

Identical circuits handle CH2.

THEORY OF OPERATION

FreeSpace® Model 1B Equalizer Card

Introduction This card is intended for use in the AmPlus™ 50 and 100 amplifiers. It accepts a full range

(50Hz to 16kHz) signal, equalizes it, and passes a full range signal back to the main amplifier signal path.

Refer to the Free Space Model 1B EQ Card schematic diagram, sheet 1 of 1 for the following information.

The equalization is segmented, with one block (U2 and U1, all sections [D1-8]) dedicated to bass region equalization for the Model 1B Bass Module. Following the output of this section, U2A [D1], the signal is presented to two parallel equalization paths, one comprised of U3 [B4-7],U4B [C3], and dedicated to EQ for surface mounted Bose Space System satellite speakers (Models 25, and 32). The other path, comprised of U5 [B4-7], U4A [B3] provides equalization for Bose Model 8 flush-mount satellite speakers.

Free

The operation of all three equalizers is similar. Considering the bass equalizer, we see U2B's [D7] output passed through R8 [D7] and into the non-inverting input of U2A [D2]. This input is extended as a bus to which EQ sections Bass 1 [D6] and Bass 2 [D5] are connected. These will introduce dips into the audio response. Section Bass 3 [D4] is connected to a potentiometer straddling U2A non-inverting and inverting inputs. When the wiper is moved toward the non-inverting input, the section introduces a dip; when moved toward the inverting input, a peak.

Each of the EQ sections utilizes a gyrator-connected op amp in conjunction with a series capacitor to simulate an LCR series tuned circuit. The values of the capacitors and resistors are chosen to implement EQ dips and/or peaks at the appropriate frequency, amplitude, and Q to realize the desired EQ curves. Each EQ section has optional steering resistors that could allow other curves to be implemented in the future with the same card. There are also some spare sections not currently used.

S1 [B2] selects either the flush or the surface mount EQ curve, while potentiometer R33 [D1] provides a boost/cut range of adjustment of the 90Hz bass region. Pin 12 of J1 [B2] is grounded and is sensed by the dynamic EQ circuit on Sheet 2 of AmPlus 50 and 100.

GENERAL INFORMATION

Opti-Voice

Page and Opti-Source™ Option Cards

The Opti-Voice Page and Opti-Source Option Cards are used with the AmPlus™ 100 Amplifier only. They cannot be used in the AmPlus 50 Amplifier.

Note: If you have either a Source or Page Option Card, you may install it in either option card slot. If you have one of each, you must install the Source Card in the first, or left-most from the rear, slot. This is due to the music "ducking" feature of the Page Card, whereby the music signal is muted during a page and then ramped back up to its previous level after the page is completed. You can install two of either card into the same amplifier for extended source or paging capabilities. You can also use several AmPlus 100 amplifiers in an extended system to create a wide range of possible configurations. The Opti-Voice Page and Opti-Source Option Card controls are explained on pages 13-18 to assist you in troubleshooting.

Equalizer Cards

The AmPlus Business Music Amplifiers can be used with various Equalizer PCBs plugged into the internal slots to allow equalization for various Bose

loudspeakers. These include the Model 1B Equalizer PCB, and the Model 8 and Model 25/32 Equalizer PCBs which are documented in this manual.

DISASSEMBLY/ASSEMBLY PROCEDURES

REFE PERA /OR P

CE TH

POSE

R INS

CEDU

FORM

Installation Instructions

1. Opti-Voice

Page and Opti-Source™

Option Cards

Note: Refer to Figures 1 and 2 for the

following procedures.

CAUTION

RISK OF ELECTRICAL SHOCK

DO NOT OPEN

AVIS

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

AND

Figure 1. AmPlus™ 100 Rear Panel

1.1 Facing the rear of the AmPlus 100

Amplifier, remove the two screws that secure the cover plate for the option card slot that you wish to use.

Note: If you have both an Opti-Voice and an Opti-Source Option Card, you must install the Source card into the left slot, because of the music "ducking" feature of the Page card.

Page

2. FreeSpace® Model 1B, Model 8, and Model 25/32 Equalizer Cards

Note: Refer to Figures 3, 4 and 5 for the

following procedures.

CAUTION

RISK OF ELECTRICAL SHOCK

DO NOT OPEN

AVIS

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK,

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

WARNING

REFER TO YOUR INSTRUCTION MANUAL FOR PROPER INSTALLATION AND

OPERATING PROCEDURES. INCORRECT WIRING MAY RESULT IN DAMAGE

AND/OR POOR PERFORMANCE.

Figure 3. Top Cover Removal

2.1 Using a phillips-head screwdriver,

remove the five screws that secure the AmPlus amplifier top cover to the amplifier chassis.

2.2 Lift the AmPlus amplifier top cover straight off.

EQ CARD 1 EQ CARD 2

CAUTION

RISK OF ELECTRICAL SHOCK

DO NOT OPEN

AVIS

PAGE 1 PAGE 2

PAGE 1

GAIN LEVEL

-20 +30

TRIGGER LEVEL

OFF MIN MAX

Opti-voice

GAIN LEVEL

-20 +30

PAGE CARD

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

PAGE 2

LINE OUTPUTSINPUTS

CH 1 CH 2

OFF MAX

MIN

TRIGGER LEVEL

TO REDU

DO NOT EX

REFER TO YOU

OPERATING PRO

AND/OR POOR PER

Figure 2. Option Card Installation

1.2 Slide the Option Card into the card

cage until it engages with the connector.

1.3 Secure the Option Card to the amplifier with the two screws removed in step 1.1.

EQ CARD 1

EQ CARD 2

J10

Figure 4. EQ Card Installation

2.3 On the Main PCB, you will see two

jacks marked J9 and J10. (On the AmPlus 50 amplifer you will see only J9).

2.4 Plug the EQ Card into either J9 or J10, as appropriate for your installation, until it is fully engaged into the connector.

DISASSEMBLY/ASSEMBLY PROCEDURES

Note: The Equalizer PCB will only plug

into the connector one way.

2.5 Observing orientation, place the amplifier top cover onto the Amplifier.

2.6 Secure the top cover to the amplifier using the five screws removed in step 2.1. (see Figure 5.)

CAUTION

RISK OF ELECTRICAL SHOCK

DO NOT OPEN

AVIS

RISQUE DE CHOC ELECTRIQUE

TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK,

NE PAS OUVRIR

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

WARNING

REFER TO YOUR INSTRUCTION MANUAL FOR PROPER INSTALLATION AND

OPERATING PROCEDURES. INCORRECT WIRING MAY RESULT IN DAMAGE

AND/OR POOR PERFORMANCE.

Figure 5. Top Cover Replacement

OPTI-VOICE® PAGE OPTION CARD CONTROLS

Setting Internal switches

There are several switches on the Opti-Voice Page Option Card that must be set before the card is installed into the AmPlus™ 100 amplifier.

1. Page Assignment switches - Use these microphone switches to send your page sources to the required zones.

2. Microphone Pad switches - When using microphones, place the gain switch in the +30dB position. For line level sources, place the switch in the 0dB position.

3. Opti-Voice Compressor switches - To engage the Opti-Voice compressor feature for Channel 1 and/or Channel 2, place these switches in the "IN" position. Engage the compressor when users vary how loudly they talk into the microphone or how closely they hold the microphone to their mouths. The compressor maintains a constant output level for inputs varying over a 30dB range. The gain LED will glow green when the compressor is active, but flashes red if the paging circuit is close to being overloaded.

Note: Do not use the compressor when:

• There is a tendency for feedback (a howling or screeching noise caused by the loudspeakers being picked up by the microphone).

• The source is a line level signal sent from a mixer or amplifier with similar signal processing.

4. Line Output Mix switches - Use these switches to set up a line output mix. If the line output will not be used, leave the switches in their factory preset positions. Send music, page1, page 2, or page 1/page 2 to the outputs using the table shown in the figure above.

Note: For a mix of page 1/page 2 and music, use the line outputs on the rear of the AmPlus 100 amplifier.

OPTI-VOICE® PAGE OPTION CARD CONTROLS

Making connections and setting levels

Setting system controls

1. Set your system controls as follows (see figure above)

1. Page Source Gain control: Set to -20dB

2. Page Trigger level: Center

3. Page Level control: Center

4. AmPlus™ 100 remote control: Set to 3 o'clock (about 5dB of attenuation)

2. Connecting your page sources

1. Use the quick-connect terminal blocks to connect your page sources to the Opti-Voice Page

Option card page inputs, and to connect the line outputs to other peices of equipment in your system.

3. Setting levels

1. During these system adjustments, have another person continuously speak into the

microphone while you adjust the controls. A music source should also be playing. For best results, make sure the person who is speaking:

• Holds the microphone approximately 6 inches (15cm) away from his or her mouth.

• Speaks at a normal volume.

• Holds the microphone's push-to-talk switch ON during the adjustments.

Some microphones do not have a push-to-talk switch.

OPTI-VOICE® PAGE OPTION CARD CONTROLS

2. To adjust the levels for the paging system, follow these steps:

1. While another person is speaking into the microphone, adjust the page trim on the

Opti-Voice card until the compressor LED on the Opti-Voice card flashes red during the loudest speech passages. Then, turn the trim down slightly until the LED glows green at all times. If the Opti-Voice compressors are disabled, turn the trim down slightly until the LED no longer flashes red.

2. While continuing to speak into the microphone, slowly turn the page trigger level control down (to the left) until paging is disabled and the page trigger LED no longer glows green. Turn the page trigger level control back to the right until the paging comes ON again.

3. Now have the speaker stop speaking. The page trigger LED should go out and the music should fade back in.

4. Have the person resume speaking. The page returns and the music source has disabled.

5. Adjust the page level until the person speaking is just loud enough to be heard clearly. Note: Be sure to set the paging level loud enough to be heard in noisy environments,

such as when a room is filled with loud patrons.

6. If you are also using the Opti-Source™ card, ensure that the page/music balance is good for both "A" and "B" sources. If the balance is poor, refer to the procedure in the Opti-Source card section of this manual for setting source levels. After the "A" and "B" source levels are satisfactorily set, return to this section to check the page/music balance.

OPTI-SOURCE™ OPTION CARD CONTROLS

CH. 1

123

FADE DELAY

CH. 2

SOURCE B

INPUT

MANUAL

CH. 1

AUTO

A/B MODE

MANUAL

CH. 2

AUTO

INPUT MODE

CH. 1 GAIN

ENABLE

CH. 1

DISABLE

COMPRESSORS

ENABLE

LED'S

CH. 2

DISABLE

CH.1

LEVEL

CH. 2 GAIN

CH.2

LEVEL

LINE

OUTPUTS

Setting internal switches

There are several switches on the Opti-Source card that must be set before the card is installed into the AmPlus™ 100 amplifier.

1. A/B Mode switches - To switch between "A" and "B" sources using the A/B switch located on the Zone 2 Remote Volume control, place the mode switch for the appropriate channel to the MANUAL position. If both channels of the AmPlus 100 amplifier are being used to power one listening zone, place both channel 1 and channel 2 mode switches to the MANUAL position. To switch "A" and "B" sources automatically (without using the A/B switch located on the Zone 2 Remote Volume control), place the mode switch for the appropriate channel to the AUTO position. If both channels of the AmPlus 100 amplifier are being used to power one listening zone, place both Channel 1 and Channel 2 A/B Mode switches into the AUTO position.

2. Music Compressor switches - For a two zone application in which only one of the two zones will require automatic A/B switching, place the Mode switch into the AUTO position for channel 1 only. To engage the music compressor feature, place the Compressor switches to the ENABLE position.

3. A/B Fade Delay - If you are using automatic A/B switching, you may choose how long you would like the "B" source to delay before fading in after the "A" source is finished playing. The internal wait switches allow a range of 4 to 25 seconds. If you are using a CD player as your "A" source, an 8 second wait is recommended as a starting point. In most cases, this will account for the silence that occurs between selections on the CD. Depending on your source, longer or shorter waits may be appropriate. Refer to Table 4 for switch settings for S6 and S7.

OPTI-SOURCE™ OPTION CARD CONTROLS

Connecting your components

1. Use the supplied quick-connect terminal block to connect the "B" source to the Opti-Source card inputs.

2. Connect the "A" source to the AmPlus™ 100 "A" source inputs on the amplifier rear panel at J1.

3. Connect the Zone 2 Remote Volume control to the remote volume terminal on the OptiSource card.

INPUTS B CH 1

+ – + –

BOSE CORPORATION FRAMINGHAM, MA 01701-9168

CH 2

INPUT MODE

MONO

2-CH

Opti–S

OURCE™ SOURCE EXPANSION CARD

GAIN

CH 1

-40 0dB -40 0dB

CH 2

LEVEL CH 1

min max min max

CH 2

A/B REMOTE

A B

CH 1

CH 2

A B

Setting System Controls

Set the System Controls as follows:

1. If your sound system has been designed for mono sound and you are sending both "A" and

"B" sources to one zone, place the input mode switch to the MONO position.

2. If "A" and "B" sources are being sent to one zone, but stereo is desired, place the Input Mode switch to the 2-CH position.

3. If the AmPlus 100 amplifier is being used to power two zones, but only one zone needs A/B switching, place the Input Mode switch to the 2-CH position.

4. If you are switching four zones (two per source) place the Input Mode switch in the 2-CH position.

5. Before setting gain levels, turn the Remote Volume control's pot fully counter-clockwise. If you are using the source card in the manual mode, place the A/B switch to the "A" position.

Setting Gain Levels

If the music compressor is "ON"

1. Begin with the "A" source. Play a music selection that represents the loudest music that will

be regularly played. Adjust the source "A" level controls on the rear of the AmPlus amplifier until the music compressor LED glows green. If the LED changes to red, the level is too high; lower the gain control until the LED stays green.

OPTI-SOURCE™ OPTION CARD CONTROLS

Setting Gain Levels (continued)

If the music compressor is "ON"

2. Switch the A/B remote control to "B" and adjust the "B" source gain level at the Opti-Source

card. (If you are using the card in the AUTO mode, turn the "A" source off and turn the "B" source on). Adjust the "B" source gain until the music compressor LED glows green. If the LED changes to red, the level is too high; lower the gain control until the LED stays green.

If the music compressor is "OFF"

1. Begin with the "A" source. Play a piece of music that represents the loudest music to be

played regularly and adjust the source "A" level controls on the rear panel of the AmPlus™ 100 amplifier until the music compressor LED changes to red. Lower the gain control until the LED stays off.

2. Switch the A/B remote to "B". Adjust the "B" source gain level at the Opti-Source card. If you are using the card in the AUTO mode, turn the "A" source off and turn the "B" source on. Adjust the "B" source gain until the music compressor LED changes to red. Lower the gain control until the LED stays off.

Setting Channel levels

1. Turn both Opti-Source card level controls fully counter-clockwise.

2. Turn the remote volume control pot fully clockwise (full volume). With the "B" source playing

and the remote switched to "B" (if in the AUTO mode, the "A" source should be off), turn each level control on the Opti-Source card in a clockwise direction until you have reached the maximum desired listening level for the sound system.

3. Switch to the "A" source (using the A/B switch or, if in AUTO mode, by turning the "A" source on). If "A" is louder than "B", use the "A" source level controls at the rear of the AmPlus 100 amplifier to lower the "A" level. If the "A" source is not loud enough, switch back to "B" and use the gain controls on the Opti-Source card to decrease the level of the "B" source. Then use the level controls on the Opti-Source card to re-adjust the sound system for desired loudness.

4. If necessary, switch back and forth between "A" and "B" sources and make further adjustments to fine tune the level matching between the two sources.

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