11
10) Right balanced input on XLR connector, this connector is wired in parallel to connector ‘9’.
This allows you to link the balanced signal to another amplifier.
11) APC right channel on/off switch:
always leave this switched on.
Warning: turning off the APC circuit will also bypass the amplifier’s output stage
temperature protection. This is for service purposes only.
12) APC power control right channel: turn the APC control to achieve the desired program output
power. The indicated power level is in reference to a 4 ohms speaker load. This can also be
used for environmental noise limiter purposes. The APC circuitry will reduce the input stage
gain to guarantee the preset program power output with musical dynamics.
13) Tube/solid sound selector: set this switch to the tube setting for authentic tube like sound, or
to solid for normal applications. The differences are very subtle and will only be noticeable on
very high quality speaker systems ! Set this one to solid for normal applications.
14) APC power control left channel: turn the APC control to achieve the desired program output
power. The indicated power level is in reference to a 4 ohms speaker load. This can also be
used for environmental noise limiter purposes. The APC circuitry will reduce the input stage
gain to guarantee the preset program power output with musical dynamics.
15) APC left channel on/off switch:
always leave this switched on.
Warning: turning off the APC circuit will also bypass the amplifier’s output stage
temperature protection. This is for service purposes only.
16) Left balanced input on XLR connector, this connector is wired in parallel to connector ‘17’.
This allows you to link the balanced signal to another amplifier.
17) Left balanced input on XLR connector, this connector is wired in parallel to connector ‘16’.
This allows you to link the balanced signal to another amplifier.
18) Left unbalanced input on cinch connectors: use the top or bottom cinch connector to apply an
unbalanced signal on the left channel. These connectors are wired in parallel, this means you
can use the second connector as a signal link connector.
19) APC active led left channel, this is a copy of the front panel APC led.
20) Left channel input level control: turn the level control to a level that guarantees distortion free
music under all circumstances, avoid clipping at the input at all costs !
21) Bridge mode switch: push this switch to convert the amplifier into a mono bridge amplifier.
In this case you can apply an input signal to the left channel only ! Leave the right channel
connectors open ! Bridge mode input level is controlled by the left channel level controller
(‘20’) only. Connect your speaker to the right c(plus) connector and to the left
c(plus) connector ! Never use the speaker output –(minus) connectors in bridge
mode ! The led above the bridge mode switch will indicate that the amplifier is in bridge mode.
Minimum bridge mode speaker load is 8 ohms.
