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annoying whine through speakers...
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<blockquote data-quote="maylar" data-source="post: 8301141" data-attributes="member: 541144"><p>The classic alt whine is due to different ground potentials between the HU and amp. Connecting them together through RCA cables lets ground currents flow through the RCA shield. If you have used a ground loop isolator between the HU and amp then you've removed the "loop" and the whine should have stopped. Something else is wrong. Try yanking the RCA's out of the amp and see if the whine is still there. If so, the problem is with the amp ground.</p><p></p><p>If not, you would need to isolate ALL the RCA's, not just the front channels. I have an old install that whines only when all 4 channels are plugged into the amp (front and sub).</p><p></p><p>And as a last resort - this will sound sacrilegious to some folks, but - using high level signals off the HU speaker outputs instead of RCA's usually fixes any alt whine. I'm feeding my front stage from speaker levels to an Audiocontrol EQL that has true differential high level inputs. This scheme is essentially a low impedance balanced line.</p></blockquote><p></p>
[QUOTE="maylar, post: 8301141, member: 541144"] The classic alt whine is due to different ground potentials between the HU and amp. Connecting them together through RCA cables lets ground currents flow through the RCA shield. If you have used a ground loop isolator between the HU and amp then you've removed the "loop" and the whine should have stopped. Something else is wrong. Try yanking the RCA's out of the amp and see if the whine is still there. If so, the problem is with the amp ground. If not, you would need to isolate ALL the RCA's, not just the front channels. I have an old install that whines only when all 4 channels are plugged into the amp (front and sub). And as a last resort - this will sound sacrilegious to some folks, but - using high level signals off the HU speaker outputs instead of RCA's usually fixes any alt whine. I'm feeding my front stage from speaker levels to an Audiocontrol EQL that has true differential high level inputs. This scheme is essentially a low impedance balanced line. [/QUOTE]
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annoying whine through speakers...
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