Question about Alpine MRP-M650 Car Audio Amplifier

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Alpine MRP-M650 problem

The Amp has power goin to it and there is 14v comin out of the ground which makes me believe that it has the sufficent amount of power needed but teh LED light does not turn on and nothing comes out from the sub at all. The fuses all look and tested fine which then brings me to asking part. Thanks for any help.

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Re: 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

Posted on Jun 30, 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

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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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Will it push 2 alphine type rs

no it could one 12 but no 2 and def not a 15 when mach speakers to a amp you want to mach up the rms power you want to amp to put out enough to power bolth speakers so like 2 500 watt rms you would want a 1000 watt rms amp

Apr 01, 2010 | Alpine MRP-M650 Car Audio Amplifier

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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

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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

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I have a mrp- m650 and will not put out any sound


Dec 28, 2008 | Alpine MRP-M650 Car Audio Amplifier

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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???

Dec 19, 2007 | 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.

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

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