- Everything is pretty quiet except for some of my samplers and synth
equipment, what should I do to fix the noise problem?
Most samplers and synths will run a lot quieter when using balanced power.
Occasionally there are a few pieces of gear that will still have noise
problems even with balanced power. Most of this equipment is music industry
or semi-professional gear with unbalanced connections. The best way to
approach this problem is to balance and isolate the audio signals by using
audio isolation transformers, then run the balanced signals to the balanced
inputs (or outputs) on the mixer. These are often much quieter than unbalanced
By using balanced power and balancing sampler and synth connections, the
noise floor of a keyboard setup can in many cases be reduced by 20 db or
more. If the console only has unbalanced connections, unbalanced to unbalanced
audio isolation transformers can be used with good results.
With balanced power, it is often possible to interface unbalanced outputs
to balanced inputs without using audio isolation transformers and without
inducing noise problems. If noise results, lifting the shield at Pin 1
of the balanced input will usually solve the problem. If it doesn't, an
isolation transformer or direct box will almost always work. Once most
of the noise has been reduced by balanced power, it is easier to identify
and solve problems.
See Equi=Tech Technical Support Bulletins: Audio
Wiring and Grounding and The
"Dirty Chassis" Condition for more information.
(c) Copyright 1996 Equi=Tech Corporation all