Audio Developments AD144 - Manual (Page 33)

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Monitor 2 Output is on an ‘A’ type stereo jack (22) for driving headphones. This is
duplicated on the connector panel. It is recommended that the headphones used
have an impedance of 600 ohms or greater. This will ensure the overall operation of
the mixer remains within its optimum specification.
An auxiliary return function, associated with the master output, is also present on this
module. The return signal is of an unbalanced stereo form and appears on an ‘A’ type
stereo jack mounted on the connector panel. The return level to the master output is
controlled by preset potentiometer (23). The signal is routed to the master output
using push switch (1). Left auxiliary return signal is sent to masteroutput left and right
auxiliary return signal is sent to master output right. The return signals mix with any
other signals that are present at the master output.