Using Main Outputs; Avoiding Ground Loops - Alesis Wedge Reference Manual

Using Main Outputs

When you want to effect everything on the mixer, you can connect the Wedge
between the mixer's outputs and the amplifier's or tape machine's inputs. This is
done by using two 1/4" cables to connect the Left and Right Main Outputs of the
mixing console to the [LEFT] and [RIGHT] inputs of the Wedge. The [LEFT] and
[RIGHT] outputs of the Wedge are then connected to a stereo amplifier, or two input
channels of another mixing console (for sub-mixing applications).
Remember to turn off Dry Defeat. In the Insert and Main Output hookups described
above, the entire signal passes through the Wedge, with no alternate path for the
dry signal. If you use these methods, remember to turn the global Dry Defeat
feature (UTIL menu p. 1, [D] control) OFF. If it is ON, you will hear too much effect
and no direct signal at all.

Avoiding Ground Loops

In today's studio there are many opportunities for ground loop problems to occur.
These show up as hums, buzzes or sometimes radio reception and can occur if a
piece of equipment "sees" two or more different paths to ground. While there are
methods to virtually eliminate ground loops and stray radio frequency interference,
most of the professional methods are expensive and involve installing a separate
power source just for the sound system. Here are some easy helpful hints that a
professional studio installer might use to keep those stray hums and buzzes to a
minimum.
Ê KEEP ALL ELECTRONICS OF THE SOUND SYSTEM ON THE SAME AC
ELECTRICAL CIRCUIT. Most stray hums and buzzes happen as a result of
different parts of the sound system being plugged into outlets of different AC
circuits. If any noise generating devices such as air conditioners, refrigerators,
neon lights, etc., are already plugged into one of these circuits, you then have a
Wedge Reference Manual
Connections – Chapter 2
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