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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  • 33 Answers

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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1 Answer

I have a JVC ks-ax302 amplifier and the sound is surging(on/off) the sub still has sound. I noticed when the sound is surging the green light on the amp also surges. I checked the power inputs the both...


Check the RCA cables, this is generally a sign of the RCA cables grounding in the insulation. This would be if you are getting a sound like a heart beat from your subs.

This is a 160 watt amp though.

Could also be a weak ground. Make sure you use a solid ground like the seat belt bolt or brace behind the back seat. A solid ground is best if you remove any paint before bolting the ground down as well.

Also might be the amp is clipping. Try reducing your gains and double check to make sure you are using the proper wiring diagram. This is a 2 ohm stable amp, any lower ohm load will cause problems with the amp.

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1 Answer

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1 Answer

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Hello korre,

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1) Check the onboard fuses. The M605 has 2 each 30A fuses just to the left of the power and ground terminals.
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3) Make sure your head unit RCA's are plugged into the inputs and not the outputs.
4) Check the low-pass and subsonic filter settings. If low pass is turned all the way down, the amplifier would ONLY send frequencies below 30Hz to the speakers. Subsonic turned on and the low pass all the way down would effectively result in no sound.
5) Remove the top cover to access the mode controls and display. Check the input level.

If everything checks out, the amp probably has a defective component and needs factory/service center repair.

Hope this helps.

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1 Answer

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