Question about Alpine MRP-M450 Car Audio Amplifier

2 Answers

Amp light flickering

Ok so today it was kinda muggy i had my windows down i have a chevy 2500HD with a CVR12 kicker with the alpine MRP M450 in a vented box (which i just got yesturday)... anyways my sub is turning on and off... the amp has power and so does the head unit... i have know clue what is wrong... and also after the sub stops working i look at the amp and the blue light is kinda flickering, not shuting off but diming then coming back then diming then coming back... and this only happens when the sub is not working... i have no clue and im getting realy upset with this thing... if you could please help... thank you!

Posted by on

  • 2 more comments 
  • ryguy5190 Jun 30, 2008

    I'm currently having the same problem.
    My alpine amp's blue power light on it keeps flickering on and off, so it's obvious that the power is not steady to it for some reason. I know nothings blown because it was doing this like 3 weeks ago and then all of a sudden it worked fine, but now it's back to doing this.

  • Anonymous Mar 25, 2009

    Alpine mrp m650 amp. was working just fine and then stopped played around wit wires and worked. So i w ould assume bad onnet some where.

    Tested power wire (it reads 14.57v) so the power and ground is good as far as power going through.

    Stero wire is conneted fine to head unit and amp.

    The light some times comes on but not for long. Through browsing the internet i found to connect battery to stereo it now will ome on bright and solid but flikering alot will put out bass one tenth of the time during a song

  • ryguy5190 May 11, 2010

    Thanks howdoiuhhhh.
    My connection to the battery was a little lose so i tightened the bolt right to it and now it works fine!
    I really appreciate it.

  • Anonymous Mar 16, 2014

    My head unit has a remote turn-on lead for an amplifier. I have attached that were it goes between the positive and negative terminals on the back of the amp. When I turn on my system, the blue light on the top of the amp turns on just for a second and then off again. I cannot get the amp to stay on. I by-passed the remote turn-on and went right to an accessory plug in the fuse box and same thing. Any ideas?



2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 21 Answers

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

Posted on Jul 04, 2008

  • howdoiuhhhh Jul 04, 2008

    oh yea sorry ryguy, check your power connections under the hood, CHECK FOR A GOOD GROUND, this is the reason for lots of problems.........


  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Expert
  • 113 Answers

You should also check your remote turn on wire

Posted on Jul 04, 2009


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

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

Best amp for Kicker Sub

Hello dalex7,

The Kicker 08ZX400.1 would be a great amp for your subwoofer. It will work into a 4ohm load with no problems.

But you can buy an amp with more power, looks better, has a smaller footprint, and cost less than the 400.1. I'd look at the Alpine MRP-M500. Take a look at it here at Crutchfield. The M500 is also easy to install, runs cool, and is very efficient.

Hope this helps.

May 21, 2009 | Jl Audio CVR12 Kicker 12" CompVR Series...

2 Answers

Alpine amplifiers fade in and out durring high volume bass hits

main problem i think you are having is your loosing power when it kicks a note.. get a power cap! power caps feed your amps constant power! this will solve your problem :)

Jan 06, 2009 | 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

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

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

Alpine mrd-m500



Could not find exact, but close manual.  It is the MRP-M450 mono block amp from alpine.


Go to this url and view in Adobe. Print it if you need to

Oct 19, 2007 | Alpine MRD-M1005 500W x 1 mono subwoofer...

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

2 Answers

Alpine mrp-m450 Amp won't stay on

im having the same problem with my amp, I took it to best buy and they said the amp was recieving power and recieving signals from the deck and i had everything hooked up right but that in the circuit board all the connections were blown, meaning i have a blown amp, i hope this isnt your problem but it definetly sounds like it. GOODLUCK

Nov 12, 2006 | Alpine MRP-M450 Car Audio Amplifier

Not finding what you are looking for?
Alpine MRP-M450 Car Audio Amplifier Logo

1,280 people viewed this question

Ask a Question

Usually answered in minutes!

Top Alpine Car Audio & Video Experts

xxxxxx xxx

Level 3 Expert

4899 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