Bose AmPlus 50 Supplement Manual page 18

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 loud-
ness.
4. If necessary, switch back and forth between "A" and "B" sources and make further adjust-
ments to fine tune the level matching between the two sources.
18