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Grounding Techniques
We also recommend that you use balanced audio cabling and
connectors wherever possible. The MIXPAD provides electronically
balanced inputs for mono line channel inputs and for its main outputs.
The wiring diagram in the “Connecting The MIXPAD” section of this
manual (on page 19) shows how 1/4" TRS (Tip/Ring/Sleeve) connectors
should be wired for use with these inputs and outputs.
In addition, you can minimize possible interference by planning your
audio, electrical, and computer cable runs so that they are as far apart
from one another as possible and so they don’t run parallel to one
another. If they have to cross, try to ensure that they do so at a 90°
angle (that is, perpendicular to one another). In particular, try to keep
audio cabling away from external AC/DC adapters.
Another, less common problem you may encounter is that of
oscillation
(a ringing tone), which, apart from being annoying, is potentially
dangerous to your speakers. This is generally caused either by poor
outside wiring or by returning a signal out of phase (most commonly from
an outboard signal processor). If audible oscillation occurs, try isolating
each input signal by turning down all other inputs. If one signal alone is
causing the problem, you should be able to eliminate the oscillation by
reversing that signal’s phase (many signal processors have a switch that
allows you to do this).