Question about Alpine MRP-M350 Car Audio Amplifier

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Alpine MRP-M350 amp intermittently turns off

I've had this amp for about 4 years now.  Until recently, I had not had one single problem with it.  Now, the amp turns off (blue LED not lit) whenever I push my subwoofer EQ above +5 (it is supposed to be able to go up to +15) or turn volume above 15 on my Alpine head unit.  The outside of the amp is warm to the touch, but not hot.  The amp will turn off for a few hours and then all of a sudden kick back in.  The two 20 amp fuses have been checked and they are both fine.  Do these amps have an internal temperature sensor that might be kicking off the amp?  If so, how can I cool the amp down so that this doesn't happen?  What other problems might cause this behavior?
Other info:  -amp is connected to 2 12" RF subs -this has been happening the last two days, when it has been warmer outside -the gain on the amp is set to nominal

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  • Ploutz24208 May 27, 2008

    One of the things I tried when I was troubleshooting this was disconnecting the RCA plugs and the speaker wire from the amp.  If the problem was with the subs, the amp should've worked with this "stripped down" version, with just the battery, remote, and ground connected to the amp.  However, the amp again would not turn on, and the blue LED stayed off.  

  • renegade443 Oct 19, 2008




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Could be your speakers are breaking down inside and shorting out. Measure the ohms of the speakere with them unhooked form the amp. They should be about what the manufacturor rated them at. (useually 4 ohms). If they are failing, the number will be lower. They may also short when power is applied- and that wont show with the meter test.

Try different subs.

Posted on May 27, 2008


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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Apr 08, 2010

  • 111 Answers

SOURCE: I have a Alpine MRP-M350

From the plus(+) of the speaker output on the amplifier run a cable to the plus(+) on the voice coil of the first subwoofer then follow thru with the same cable to the plus(+) of the other subwoofer.
From the minus(-) of the speaker output on the amplifier, run a cale to the minus(-) of the first subwoofer then follow thru with the same cable to the minus(-) of the other subwoofer.
This will make your amplifier run @ 2OHMS and provide you with 350 Watt RMS which will work fine even if you run your subwooffers free air(without a box))
hope this helps

Posted on Feb 06, 2011

  • 111 Answers

SOURCE: i have two 12 inch

You dont specify the model or RMS power of the subwoofers so i am not sure if that power is RMS or maximum.
If it is RMS, then a BiG no would be the answer. Even though the MRP-M350 will drive the subwoofers and will give you a fair sound as well, it not drive both of them effectivley. After all it's only 350WATT (the amp)RMS trying to push a 2500 RMS (the subs) target, so do the maths, is that a fair fight?
hope this helps.

Posted on Feb 06, 2011

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