Question about Alpine MRP-M650 Car Audio Amplifier

1 Answer

MRP-M450 puts out no sound to the subs

I have an MRP-M450 and the power light turns but it doesn't put out anything to the subwoofers. It all worked perfectly fine after I hooked it up but i was driving and my subs just stopped working with the amp. I have checked the subs on a different amp and the work just fine.

Posted by on

  • 1 more comment 
  • ksoles9250 May 20, 2008

    The light LED light turns on and i have checked ground, power, and turn on wires and they are all good. I checked both the RCA inputs of the stereo and the amp and both are working fine. I have checked my sub and it still works and is not blown. What could be the problem? What should I do?

  • jutter87 Dec 15, 2008

    ive had this same ampo same problem it happens alot!! havent found a fix yet

  • malok33 Dec 28, 2008

    I have the same problem except mine is the 650, let me know if you find a answer.



1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 12 Answers

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.

Posted on Jan 07, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Just bought a alpine mrp-m450 amp and It turns on, I have my rca input connected and my output to my sub but my sub isn't making any noise, my sub is fine I just tested it

make sure the protection light isn't on. Also, make sure your are getting signal through the rca's. you may have to turn the sub on, in the radio settings.

Dec 27, 2014 | Car Audio & Video

1 Answer

I haw alpine mrp-m350 amplifier how many sub can i

Hook up the MRP-M350 to one 4-ohm sub, and you get 200 watts RMS; connect a second 4-ohm subwoofer and the power output increases to 350 watts! All that juice means that your subs won't just be loud, they'll sound clean and thumping.

Apr 08, 2010 | Alpine MRP-M350 Car Audio Amplifier

1 Answer

Wheres the power.. No bump

it might be that your subs are too powerful for the amp, check the model of the sub or subs online and check out how many watts they can take, because you might need to upgrade your amp or downgrade your subs

Jul 03, 2009 | Alpine MRP-M450 Car Audio Amplifier

1 Answer

Subs cut out at low volume no matter the settings

I'm not a complete audio expert but it sounds like somethings over heating or you have a blown out put bridge.

Jun 20, 2009 | Alpine Type-R SWR-1222D Car Subwoofer

2 Answers

Amp light flickering

do you have a capacitor its like an extra battery, if you turn the volume way up with cvr's pullin big power, it cuts out because theres not a steady flow of power.... hope this helps

Jun 30, 2008 | Alpine MRP-M450 Car Audio Amplifier

1 Answer

Not enough bass

its prolly the deck, did you try turning the alpine's input gain controls up...

its not the wiring, if the wiring was insuficient, it would just melt...

you might also see if you could adjust the bass frequencies or crossover frequency, the crv might just have a different resonant frequency then the rav 4

May 16, 2008 | Alpine MRP-M450 Car Audio Amplifier

1 Answer

My Alpine m450 amp light is on but no sound

make sure your RCA's are plugged into the input and not the pass through

Mar 28, 2008 | Alpine MRP-M450 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

2 Answers

Alpine MRP M450 Problem

Sounds like it is getting too hot and a thermal overheat protection switch is shutting it off. Check to make sure your gain isnt over 3/4.

Dec 05, 2007 | Alpine MRP-M450 Car Audio Amplifier

1 Answer

Just died out..

Have you determined if the problem is with the amplifier or the subwoofer?


Have you checked the wiring to make sure that there are no loose connections?

Oct 18, 2007 | Alpine MRP-M450 Car Audio Amplifier

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

Related Topics:

358 people viewed this question

Ask a Question

Usually answered in minutes!

Top Alpine Car Audio & Video Experts

xxxxxx xxx

Level 3 Expert

4905 Answers


Level 2 Expert

150 Answers

Tygh Duval
Tygh Duval

Level 2 Expert

300 Answers

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

Answer questions

Manuals & User Guides