User manual

P1 Audio Processor User Manual Page 51
Problem : I seem to be having problems setting up the output level
control on the P1 to match my recording device to give a
consistent result.
Advice : Make sure that the expander and compressor on the P1
are switched OFF when your are setting output level
control.
Problem : I am connecting the P1 to another balanced audio device
but I am still experiencing higher than desirable levels of
hum.
Advice : There is a possibility of earth loops if both ends of the
balanced cable screen are connected to ground through
different pieces of equipment. You can try disconnecting
the cable screen at the end from which the audio signal is
being sent from see if this provides a solution.
We don’t recommend this as a normal way to wire
balanced cables for two reasons;
1. Having the cable screen earthed at one end may
turn the screen into a long antenna which can
then pick up all sorts of nasty air borne noise
signals. This is a very common problem
especially if you disconnect the screen from the
audio receiving end.
2. The cable then becomes non standard which can
create confusion in use and cause the wrong end
of the screen to be disconnected.
Never disconnect the P1’s mains plug earth connection
in an attempt to solve a hum loop problem. It is
dangerous and compromises the electrical safety of the
unit.