Question about Alpine MRP-M450 Car Audio Amplifier

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Amp light is on but doesn't put anything out to my subs

I hooked my system up about a week ago and everything worked fine. When i was driving my subs just stopped working. The light is on for the amp but it doesn't put out any power to the subs. I have checked the subs on another amp and they work fine. All of the fuses are still good but it puts out no sound

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  • Trolin Feb 26, 2008

    I have the same amp with the same symptoms. Lights no sound. Tried different sources and it is definently the amp. My other amp works fine with same sources. I have pulled cover off of amp and don't see and immediate problems. I figure the problem is in the preamp stage, but I have no schematics or an o'scope. I tested the gain/x-over/boost adjustments buy using a voltmeter to measure resistance. I was thinking if this was a common problem maybe somebody had figured out a faulty component.

  • Anonymous Mar 03, 2009

    how do u fix the problem can it be fixed

  • Anonymous Mar 27, 2009

    Same amp, same problem. It happened to me last week. Took the fuses out of the amp and placed them back into it. I think there is something loose internally around the fuses. I have the amp screwed directly on the subwoofer box and I think the vibrations from the box have caused something to come loose inside. How do you have the amp attached? directly to the box? seperate?

  • Jorge Majano May 11, 2010

    what subs do you have hooked up?

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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.

Posted on Jan 07, 2008

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Posted on Jan 02, 2017

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  • 37 Answers

SOURCE: Car amp will turn on but won't play.

Yes your amps output is burned out, you can have them repaired or start looking for new amps

Posted on Dec 06, 2008

  • 30 Answers

SOURCE: amp light is on but no power to my subs!

Hi There.

When you say the 40 Amp fuse blew. Was it your mains battery fuse or was it the fuse on the amplifier? If it was the fuse on the amplifier then you may have hurt the amplifier. The Kenwood KAC-8101D is a 1000 Watt monoblock amplifier. Therefore if you say that 1 of your woofers is not playing, then it is almost certainly blown if you are sure it is connected correctly. Try disconnecting it and only running the woofer that tries to play. If this woofer is still working correctly, you will notice a drastic drop if the sound of your bass. The reason for this is because you have changed the impedance load on your amplifier due to the fact that the other woofer is not working. Have your working woofer checked and replace the faulty woofer then you should be banging again.

Hope this helps!!

Posted on Aug 19, 2009

  • 10 Answers

SOURCE: 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

Posted on Apr 29, 2010

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