Deliriousclam hit the nail on the head. They are trying to put a high level signal into an amp that is probably less powerful than the head unit itself. This is why you have so much system noise (hiss) and the audio is blaring at low volume settings..... Any shop that cannot perform this task would not be anywhere near my audio system. I may drive by and let them look at it, but they wouldn't be touching it.
The shop should also refund your $$ for the install. How could they turn the car over to you like that in the first place? I'd be HOT.
by the way, I hope the $1000 you quoted was an exaggeration......unless it included the head unit..
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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
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