Question about Alpine MRP-M650 Car Audio Amplifier

1 Answer

Alpine mrp-m650 amp cutting out

I have a alpine mrp-m650 amp, had it professionally installed about 14-15 months, with a half faret cap, about 3 weeks ago i was driving home and had it cranked up and started to smell something burning, i immediately shut off the radio and the burning stopped. when i got home i pulled the fuse out from underneath the hood and went to the rear of my jeep to see if i could tell what was burning, hoping that it wasnt the amp. when i got to the rear of the car i "smelt" around and it smelt like it was coming from the cap, but it was dark and i didnt want to mess with it too much then. the next day i got up and went out to look again and turned on the car and the cap and amp and sub were working, that is until i turned up the volume then the sub would cut out and the cap would start to discharge and shut down. today i rewired it, bypassing the cap and went right to the amp, again the same thing would happen, it will play when first turned on but only at low volumes. is there some kind of safety switch that is shutting down the amp so there is no damage it? any ideas at all y this would happen? i thought it might be the ground so i unscrewed it and sanded it down, but it was unsuccessful. any ideas are much appreciated. thanks in advance

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 143 Answers
Re: 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???

Posted on Dec 19, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

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

1 Answer

How many watts does this amp put out

50 watts RMS x 4 at 4 ohms (75 watts RMS x 4 at 2 ohms)
150 watts RMS x 2 in bridged mode (4-ohm stable in bridged mode)

Feb 19, 2012 | Alpine MRP-M650 Car Audio Amplifier

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

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


try a 60 amp fuses if it doesnt blow when you crank it up it safer lest chance to frying something 100 amp is lots of juice

Jan 17, 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

Should I buy

If the power rating of the woofer is accurate, this amp would be a good choice.

Jan 01, 2008 | 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

Not finding what you are looking for?
Alpine MRP-M650 Car Audio Amplifier Logo

470 people viewed this question

Ask a Question

Usually answered in minutes!

Top Alpine Car Amplifiers Experts

Tygh Duval
Tygh Duval

Level 2 Expert

290 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1128 Answers

Are you an Alpine Car Amplifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides