Originally Posted by
pilmat
+1 for Brad's suggestion.
If that fails, you have a high frequency signal attached to your audio signal. Are you hooked up balanced or unbalanced? With your speaker and light set-up, you should only consider balanced. If you are running balanced, you may have a bad cable, or worse, a bad piece of hardware that is not properly processing the balanced signal.
Start with hooking everything up balanced (at BOTH ends), then look for bad cables. And finally, start unhooking one piece of hardware, see if the noise goes away, if not hook it back up and move on to the next piece. You need to find the bad egg (if cables are all OK).
Phil.
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