Question about Alpine MRP-M450 Car Audio Amplifier

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Only get sound wen rca's r in halfway

Got a new amp and wired everything 2 my best abilities...2 dif amps..1 for sub and other 4 mids..each amp ground seperatley..bout 3 feet apart.new amp is 4 the mids.wen i 1st wired the new amp,i got a veeery quiet sound from the mids...turned vol all way up and could barely hear anything..what it took 4 me 2 get sound was by pulling the rca's out of both the amp and the head unit halfway..so only the center part/prong was plugged in..when the outer part of the rca,i guess its ground?,touches the amp or head unit i lose all sound.so i pulled them out just enuf 2 get sound and taped them in place...wierd setup but that wat it took....both the mids and sub are rca from the head unit.i wanna no why this is wat it takes 4 them 2 work...on my last amp 4 the mids,i had the rcas all the way in and it worked fine.theres a lot more details i can put about my setup but im just wondering what normally is the cause 4 rca's workin wen not all the way in.i can post more if needed.

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  • Seth Bourne May 11, 2010

    maybe your rca's are at fault??? it there a way you could try the amp in a mates car or at least off a diff head unit and rca's

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You have a bad set of RCA's. Try and get a pair specifically made for car audio. There are hundreds of brands, usually the cheap ones work fine.

What usually happens is on cheap RCA cables, wires inside the actual plug split apart and short out on one another. Get another set of cables and you'll be fine.

Posted on Feb 11, 2009

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Posted on Jan 02, 2017

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