Question about Alpine MRP-M650 Car Audio Amplifier

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Problems with MRP-M650

I was driving down the freeway about a week ago when my sub stopped bumping. I have a Kenwood amp as well as the Alpine. I took my car to Direct Car Audio where they tested my amps on another sub and they said the Alpine is "no good", by which I assumed they meant blown. But since then I've noticed that at times the amp does power my sub, but it goes out whenever I turn the volume too high and does not come back. But if I turn my car off and on, then it comes back again. And lately I've been having trouble starting my car...so I'm thinking maybe it's a problem with my battery? Also, the sound quality doesn't sound as good as it did before...

Oh and the amp's light stays on. But the day it went out for the first time, I touched the amp and it was very very hot.

Would Best Buy be able to diagnose the problem?

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As far as it staying on it may have been wired to your hot unstead of your remote on your radio

when it runs wide open it gets hot
how are your gains

I have an alpine and I just hooked up jl 12 w3s and it kinda j did what yours did
it played.. hit hard then no subs.. my mids and highs platyed, but until I would turn off the car and restart the radio the subs immediately came on and the subs are only connected to this aplpine mrp m 650 amp

what speakers and what ohm did they wire it too?

i think my problem was I was overloading my amp feeding it a 2 ohm load or a one ohm load and it was shutting down my subs.. protectection I suppose?


Posted on Jun 19, 2008

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ajdriver
  • 15 Answers

SOURCE: Alpine MRP-M650 : Power LED turns on but no sound

is the remote lead properly connected to the head unit? if the power led is on then the power cable and earth must be good, check the remote lead 2 your head unit first, if thats all good try looking at the amp to see whether theres a small switch to adjust the output going to the subs, if its very low or right off then nothing will be going through to the subs. if its on high and fine it only realy leaves the neg and pos inputs from the amp 2 the subs.

cheers, adam

Posted on Nov 18, 2007

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1 Answer

My mrp m650 alpine amp power light is on but no sound. it works if i hook it to other vehicles but not in mine.


Check your speakers and speaker wires to make sure you have no shorts or grounds. Not knowing what vehicle you are putting the amp in, there is also a possibility that there may be a stock amp in the vehicle. If this is the case, you may have to rewire the speakers and bypass the stock amp.

Feb 27, 2012 | Alpine MRP-M650 Car Audio Amplifier

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When i turn my alpine MRP-M650 amp on there is a click in the sub and then nothing else. when i was driving with volume down low the sub just stopped working.


sounds like a short. did you check the amp fuse and the fuse on the power wire (under the hood) make sure there are no wires touching. most common is the wires to the sub touching on the amp. let me knwo if that helped

May 17, 2011 | Alpine MRP-M650 Car Audio Amplifier

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Subs dont work when base is up high


Sounds like the amps needing more current available to it-You should have 4 gauge power coming off the battery going into a distribution block from there a 4 gauge to a 1 farad capacitor off the block -4 gauge to the ground for the capacitor -and two + leads from the block to your amps-you would do well with 6 gauge there.- That is to ensure that you have plenty of power on tap when needed and not trying to draw it off your charging system on heavy current demands.Make sure that your grounds are well placed and solidly connected. As for putting 600+watts on a pair of 8z......i hope that they are the CVR or the L5 / L7 series to take that much power,I've seen it done and the ones i heard sounded badass(L7 series)-but that was at the stereo shop so they had they stuff on HITTN status up in there. If your running the "cvr" or the "comp" series you might be throwing too much power on them -might want to step up your subs to a set of 12s just to get more air moving in there- good luck

May 28, 2009 | Alpine MRP-M650 Car Audio Amplifier

1 Answer

Amp light is on but doesn't put anything out to my subs


if you are sure its the amp. the problem is internal. but if your not sure, try a different stereo or source of sound to the inputs of the amp. if there is still no sound than it is the amplifier and it could be a number of things.

Jan 07, 2008 | Alpine MRP-M450 Car Audio Amplifier

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MRP-M450 puts out no sound to the subs


The amplifier may be overloaded, check to see if it can handle 4 OHM loads and 2 OHM loads. if it turns off at high volume the amp may be overloaded. if so try a 8 OHM load. if it still turns off it may be an internal problem.

Jan 07, 2008 | Alpine MRP-M650 Car Audio Amplifier

1 Answer

Alpine mrp-m650 amp cutting out


Some AMPs have a thermal cutout, that switches the amp off if it gets too HOT.

But this sounds like your amp or sub is screwed, either there is to much resistance in your sub, eg: Burnt voice coil, carbon builds up on the coil stopping the sub from moving freely. Push on the cone of the sub & listen for a scrapeing sound.
or test this by continuity testing the sub terminals & pushing the cone if the BUZZER on the MultiMeter cuts in & out as you push & release then your sub is screwed. ( a certain amount of repeatative pushing it may free up the voice coil.)

or your Amp may have blown a internal fault that will have to be sent of for repair.

Or you have a incorrectly rated fuse for your system,

or the battery cant kope with the power surges???
THIS DOES NOT APPLY TO YOU AS YOU HAVE A POWER-CAP!!!

Dec 19, 2007 | Alpine MRP-M650 Car Audio Amplifier

1 Answer

Alpine MRP-M650 : Power LED turns on but no sound. All the connections are made. Subs have been tested on another amp.


is the remote lead properly connected to the head unit? if the power led is on then the power cable and earth must be good, check the remote lead 2 your head unit first, if thats all good try looking at the amp to see whether theres a small switch to adjust the output going to the subs, if its very low or right off then nothing will be going through to the subs. if its on high and fine it only realy leaves the neg and pos inputs from the amp 2 the subs.

cheers, adam

Oct 30, 2007 | Alpine MRP-M650 Car Audio Amplifier

1 Answer

Alpine MRP-M650 problem


The built in power supply is probably bad. This supplyds the voltage from the 12volts and inverts it up to 20 to 30 mvolts DC. You will need to get a manual to service this unless you know the inverter circuit really well. good Luck

Jun 30, 2007 | Alpine MRP-M650 Car Audio Amplifier

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