B&K 7250 Owner's Manual page 11

If a source other than a B&K series preamplifier is used to control multiple amplifiers,
only the control output voltage from the source is critical. It must be within the range, as
indicated on the rear panel, 5-24 volts DC is required. The amplifier will provide each
successive amplifier with a control voltage of 12 volts DC for reliable operation. The
amplifiers control output may be used as a source of 12 VDC @ 125 mA for other user
applications as well.
If the control function is desired, each unit in the system must remain connected at all
times and the control must be enabled.
ENABLE button must be out for each controllable amplifier in the system. For more
information on the amplifiers output status under various control conditions, refer to the
following table.
@ CTRL IN
Signal
Signal
No Signal
No Signal
* Note: The control voltage is for muting control only. Each amplifier must be connected
to its own source of AC power in order for it to operate.
DO NOT POWER MOTORS WITH THIS CIRCUIT.
Button position
OUT
IN
OUT
IN
To enable the control function, the CTRL
Output status
Sound
Sound
Mute
Sound
Page 9
@ CTRL OUT
Signal
Signal
No Signal
Signal
P/N 13007 Rev.0004