Question about Alpine MRP-M650 Car Audio Amplifier

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Ok i got an amp installed and would most of the time not have any sound. power is on(has the light). wat am i doing wrong?? also, when it does work my amp shuts off. and when i turn power on, light comes on and fades away immediately. are all these problems related?? pretty sure all cables are connected

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Check voltages at the main power lead to/at the amp and also
at the sense wire which switches it on when the radio is on.
Might be the wiring is too thin and is switches off when current is drawn bigger than that needed to light up the light?
That or the switching power supply inside the amp is unstable/dead.

Posted on Jan 12, 2008

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Will this give me 400 watts on each

bignatedabal: You can't get something more out of a device than it's rating. In other words, if you have a 400W amp that's all it's going to produce. For example if you're looking to drive both sub spkrs @ 350W each then buy a sub amp with a rating of 700W @ 2ohms & connect your 4ohm spkrs in parallel to the amp. Each spkr will produce 350W of sound if everything is installed correctly.

1 thing to look for in amp mfg's. Look for those who rate their amps in RMS power. This is the true output rating. Many amps are rated in peak-to-peak which seems great but doesn't tell you the real story, unless you know how to do the math to determine the RMS. The better mfg's will take the time to test their amps & rate them properly. Also look for massive heatsinking (the cooling fins). I consider cooling fans to be a benefit as well.

If you have addtional questions, drop me a line.


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If the power light is lit and the amp is not in protect mode, the power supply is probably blown.

Have you confirmed that you have a good signal reaching the amp and that the speakers are not blown?

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My amp is on but the protection light stay's on!!

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