Question about Alpine MRP-M650 Car Audio Amplifier

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

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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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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

1 Answer

What is the best amp for one 15" alpine type r?


sub spec 250watts per coil you should be just fine I have 2 typr 15s on orion hcca 2500 1 and it kicks a$$ thats 1000 watts over the rated limits of the subs only shut the amp down once these subs can take a lot more power than they say just use your common sence with the volume and gain levels

Jan 31, 2012 | Alpine Type-R SWR-1242D Car Subwoofer

1 Answer

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

1 Answer

I have a alpine MRP-M500 amp connected to 2 10 inch comp kicker subs. The problem is the subs rattle and distort. The subs have been tested ok and all the wiring has been tested also ok. What could be...


Any time that there is a rattling sound from the subs, that indicates that they are probably blown. How were the subs tested ok? If the resistance of the subs is still close to OK, that is good, but it doesn't necessarily indicate that they are working properly.
Try using different subs at a lower volume, or turning down the gain slightly.

Mar 11, 2011 | Alpine MRP-M500 Car Audio Amplifier

1 Answer

I wired my 2 alpine 10 inch type r's to 2 ohms. now when i play it they play just when i try to crank it the subs just like shut off but the amp stays on. even at low gain and low bass eq. i dont know...


It sounds like it may be going into a protect mode. You may be overloading the amp. You might want to go higher impedance and take it easy on the amp. The internal power supply MAY be collapsing under the load.

Don't believe all the numbers that manufacturers put out... we call that "Specsmanship"... in other words INFLATED numbers so you buy ours instead of theirs.

Jan 23, 2010 | Alpine MRP-M650 Car Audio Amplifier

3 Answers

I have an alpine MRP-500 amp that used to work great with my 2 10" Type-R subwoofers. Out of nowhere the sound just stopped working and still will not. I had the amp and subs tested and the guy said it was...


  • make sure the subwoofer level is up on the head unit.
  • Make sure the RCA cables are good.
  • Make sure the remote wire is connected and has 12v+ when the head unit is on.
If the remote wire is not turning on the amp, its not going to work. To hot wire it to see if thats the problem, just run 12v+ to the remote jack. That will turn on the amp.

Nov 22, 2009 | Alpine MRP-M500 Car Audio Amplifier

1 Answer

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

Problems with MRP-M650


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?


Jun 02, 2008 | Alpine MRP-M650 Car Audio Amplifier

1 Answer

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 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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