RonRizz

Matt really hates Pioneer !!! Lol
I had what sounds like a similar issue in a customers car, turned out to be a speaker wire was making ground,k as suggested above

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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals