Question about Alpine MRP-M450 Car Audio Amplifier

1 Answer

Amp not working

I just hooked up my stereo and my amp is not working. The light doesnt come on and my sub doesn't work. There is power going to the amp i checked it with a volt meter its getting 12volts the fuses are fine and i changed them as a precaution and still nothing. I know this is a very general question but any help would be great thanks

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 1,070 Answers
Re: Amp not working

My friend your amp could be getting power that does not mean that it is working.the power only goes to certain point but because your regulator or other related component is defected your amp power supply will not work until the defect is corrected.take it to a tech and have your set repaired.good luck.

Posted on Jun 11, 2007

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

1 Answer

The car had existing cables in it and i tried hooking up the amp to a sub i know works. The amp doesn't light up or anything and the sub doesnt put sound. What's wrong?

Those existing cables are suspect. Start by getting power to your amp, then connect other wires, regardless of color code, to the sub. Beware of wires that look good but really are shorted somewhere. You may have to label each wire as you go along to identify its real function. You may even have to run some new wires to replace existing ones.

Sep 05, 2015 | Kenwood KAC-5204 350 Watt Max Power Stereo...

1 Answer

My amp powers on but i get no sound and i have everything hooked up properly, what is wrong with it?

Have you tried your subs on another amp???? Or hook up a small speaker at low volume to the amp and see if it plays....If it doesnt, then the problem lies within your speaker output on your amp or your line out (rcas) on your stereo

Oct 24, 2010 | Jl Audio 500/1 Car Audio Amplifier

2 Answers

2 12" subs + 600W amp. Turn on, goes boom once, then red light

Is your gain all the way up? If it done this before, sounds like your over working the amp. Make sure your subs ohm load is capable with the amp load to. If they are 1 ohm and your amp is only 2 ohm stable, it would beat for a lil bit then go into protection mode to. Check your wires too.

May 13, 2010 | Insignia 600W Bridgeable Amplifier with...

1 Answer

My amp doesnt work

their may be a short some ware check your power line and your ground i had the same problome with mine

Apr 29, 2010 | Lanzar VIBE241 Car Audio Amplifier

1 Answer


lets do some diagnosis.. if it's possible, try hooking another known good sub up to the amp and see if that works. if it doesnt, it's an issue with your amp. if it does work though, it's an issue with your sub. or the wiring. if it's a dual voice coil sub, make sure you've got both positives hooked up to positive from the amp, and both negatives hooked up to negative from the amp. if you've accidently got positive from the amp going to positive of one voice coil then to the negative of the other, and the negative from the amp going to the negative of one voice coil then to the positive of the other, the voice coils will be pushing against eachother cancelling eachother's movements out. and this will fry the sub. OR the sub is already fried.

Feb 16, 2010 | Sony XM-2150GSX Car Audio Amplifier

1 Answer

My amp keeps going to safe mode.

It sounds like the voltage drop created by starting the vehicle is causing the amp to go into safe mode. Try starting the car before turning on the stereo system. Then turn on the stereo and see if it functions normally. If this is the case you can either live with it or possibly upgarde the amps power supply by adding a capacitor, larger battery and better cabling to the amp if necessary.

Aug 09, 2009 | Cadence Z8000 Car Audio Amplifier

2 Answers

Sony xplode 1000w amp has green light puts out no power to subs

may haveto turn sub on through the stereo itself if rca cables are good.

Jan 08, 2009 | Sony Xplod XM-1652Z 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

Protection light keeps coming on

Check the wiring between the sub and the amplifier. That's seems to be the only thing left that could cause a problem. If it's shorted to ground or pinched so the conductors are shorted together, it could cause the symptoms you listed.

Oct 01, 2007 | Sony XM-2002GTR Car Audio Amplifier

1 Answer

Car audio

hi, your amp seems to be getting power but the cables might be wrong so it's not getting enough power. the light on the amp should be green if everything is going well. are you sure the cables are suitable for your amp?

Sep 11, 2007 | MTX RT202 Car Audio Amplifier

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

Related Topics:

118 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