Question about Alpine MRD-M301 Car Audio Amplifier

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Powers up but no signal

Having trouble with my m301 amp, everything powers up - digital menu - but no sound to my sub. any ideas and pictures to what i have to replace?

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Re: powers up but no signal

Check your gain pots as well as audio pre outs on amp. sometimes pre outs will get loose and be unable to make a connection.

Posted on Jun 30, 2007

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Subs and amp sat in my garage for a year. I just

check your subs by connecting them straight from the stereo. If they work then there is an issue with the signal comming from the stereo through the rca cables to your amp, check those. Try another amp if you can with those rca's or test the amp with a friends car, either way try to rule out everything until it points to the problem.

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Sounded great for only 10min?

check your fuse on the amp hopefully you didnt burn it did you brige 2 subs into 1 channel on your amp

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you could have a bad ground or the power wire could have a short i would start there

Jun 25, 2008 | Alpine MRD-M301 Car Audio Amplifier

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looks like you need to check the SOURCE of where the signal is coming it could be that your CD car stereo SUB opt. is turn off , check the menu of SOURCE and switch to SUB on , hope this helpful

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sounds to me like you have a poor ground, which is causing the amp to overheat. make sure you have as large a gauge wire for the ground as you can and make sure it has a good connection to metal this should solve your problem.

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1 Answer

Amp shuts off

is this a new problem or has it always done it?? it mos tlikely needs repairs, but try this first. Hook up ther + of one sub to the speaker + on the amp. Hook the - of that samne sub to the + of the other sub. Then connect the - of the other sub to the speaker - on the amp. This will run the speakers in series and will put alot less strain on your amplifgier. It will not "hit" as hard but it sbetter then having it shut of fall the time. I would also make damn sure that:
Your ground wire is large enough and properly grounded. It should be BOLTED to a solid poiece of metal on your car. Use a screwdriver, whatever so scrape off any rust as the connection should be a clean, BARE METAL connection. Next make sure your power wire and fuse are ok. If you are using round glkass fuses, replace it even if it looks good. I have seen those fuse smelt the solder in the ends. They can look great but really be bad.

SO go through all the basics and if it still gives you problems then it needs repaired. Please dont rate me un-helpful.

Dec 08, 2007 | Alpine MRD-M301 Car Audio Amplifier

1 Answer

Correct settings

I am not familiar with your amp, but any amplifier performs best when the output stage effective resistance exactly matches the load resistance. So, read your 15" subs and find out number of ohms, then set the amp to that number. according to your amp's specs: if you have 2 ohm speakers, you can draw 350 watts from your amp. so purchase 2 ohm speakers

May 31, 2007 | Alpine MRD-M301 Car Audio Amplifier

3 Answers

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Make sure the amplifier setting "disable" is off then turn off remote power and turn back on.

Jan 07, 2007 | Alpine MRD-M301 Car Audio Amplifier

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