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Should Direct Ground to RCA Cause Noise?
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<blockquote data-quote="lpm" data-source="post: 8729051" data-attributes="member: 645421"><p>This seems like a strong possibility.</p><p></p><ol> <li data-xf-list-type="ol">If I run my factory amplifier off of the amplified headunit outputs, it sounds perfectly clear.</li> <li data-xf-list-type="ol">If I feed my aftermarket amplifier with the headunit RCAs I get a whine.</li> <li data-xf-list-type="ol">The whine increases with amplifier gain, but not with headunit volume.</li> <li data-xf-list-type="ol">It goes away when my rca's are unplugged and not touching anything.</li> </ol><p>This seems like some sort of ground reference voltage difference to me, a "ground loop".</p><p></p><p>What I'm confused about is that if I connect the RCA ground and the amp ground both to the negative battery cable, there should be no "loop" causing any ground reference voltage difference.</p><p></p><p>Maybe I will take a multimeter to all the grounds around the car to try to find any loops, but everyone says you shouldn't have to use any filters if your install is done well.</p></blockquote><p></p>
[QUOTE="lpm, post: 8729051, member: 645421"] This seems like a strong possibility. [LIST=1] [*]If I run my factory amplifier off of the amplified headunit outputs, it sounds perfectly clear. [*]If I feed my aftermarket amplifier with the headunit RCAs I get a whine. [*]The whine increases with amplifier gain, but not with headunit volume. [*]It goes away when my rca's are unplugged and not touching anything. [/LIST] This seems like some sort of ground reference voltage difference to me, a "ground loop". What I'm confused about is that if I connect the RCA ground and the amp ground both to the negative battery cable, there should be no "loop" causing any ground reference voltage difference. Maybe I will take a multimeter to all the grounds around the car to try to find any loops, but everyone says you shouldn't have to use any filters if your install is done well. [/QUOTE]
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Should Direct Ground to RCA Cause Noise?
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