bk av125.7 User Manual

 
A control (trigger) system is provided on both the AV125.7 and AV125.5 amplifiers to allow remote switching of 
the amplifier’s standby on/off feature. The control input is designed to operate with a source (trigger) of 5-24 volts 
AC or DC. All B&K A/V processors and preamplifiers may easily be utilized to control this standby on/off feature. 
 
In addition your amplifier has a control output circuit to allow control of an external device such as another power 
amplifier, projection screen, power strip, etc. The control output has the capability to source 12VDC @ 125 mA 
(on) or 0 VDC (off). 
 
If more that one amplifier is being controlled, the control output may be extended to include each successive unit 
by simply connecting a 1/8” mini-jack cable from the CTRL OUT connector of the first amplifier to the CTRL IN 
connector of next unit (commonly referred to as ‘daisy chaining’). An example of how to connect two amplifiers is 
illustrated in the diagram below. 
 
 

Rear view of second

amplifier with control input

Rear view of amplifier

with control input

Daisy chain to
other amplifiers

From preamplifier
rear panel
control output

+

+

 

 

 
If the control function is desired, each unit in the system must remain connected at all times and the control must 
be enabled. To enable the control function, the CTRL IN jack must have a 3.5mm mini-jack inserted for each 
controllable amplifier in the system. For more information on the amplifier’s output status under various control 
conditions, refer to the table below. 
 
*Note: The control input voltage is intended for standby on/off control only. For proper amplifier operation, it is 
recommended that each amplifier have its own source of AC power. 
 

@ CTRL IN 
 

Button Position 

Output Status 

@CTRL OUT 

Signal OUT  Sound Signal 

 

Signal IN 

Sound Signal 

 

No Signal 

OUT 

Mute/Standby 

No Signal 
 

No Signal 

IN 

Sound  

Signal 
 

 
 
 
 
 
 
 

 

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