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if its one speaker check the negative on the speaker wire all the way through. if the insulation has worn through and it is touching metal that can cuase a groun loop and cause that speaker ti whine.

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Found the problem guys....turns out both sets of my RCAs are shot. When I switched RCAs I only swapped the front set with the rear set. Before I tried the grounding method you advised me I figured I should maybe try a new set of RCAs instead of a different set before I start ripping my HU and amp out. I had a unused set waiting for when I re-install my 3Sixty.2. Plugged them in and crystal clear music came through with no feedback. I still don't know how both sets only caused feedback through that one speaker but no others. Thanks for your advice anyway guys

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Do yourself a favor and ground your RCAs to your deck while you are working on it.

CURRENT SYSTEM:

  • Alternator:
    1. Stock alt on mids/highs
    2. Isolated DC Power 270 SP - Charging @ 16.8v
  • Batteries: (2) XS D1400s
  • Power Cable: Double Runs of 1/0 KNU Kolossus Fleks
  • Headunit: 80-PRS
  • Sub Amp: DC 5.0k
  • Subwoofers: 2 RE MT 15s /PSI dual .7ohm recones
  • Subwoofer Enclosure: 9.1cubes @ 32hz - brutal.
  • Mids & Highs Amp: CT125.4
  • Active Components:
    • Mids RE XXX 6.5c
    • Highs - 3 RE XXX tweeters per side(A pillar)
  • Noise Control: Damplifier Pro all over the cab.

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Highest Legal Score: 151.0 db
Highest Musical 30 Second Average: 151.6 db
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