Question about Alpine MRD-M605 Car Audio Amplifier

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Amp gets power but no sound

If you need more info let me know b/c i am new to car audio. My amps blue screen turns on my sub works fine it was tested with a multimeter. All of my wires I think are fine ( I had 3 people look at them). The ground was moved 2 times b/c of people not thinking it was grounded. When there is music there is no sound from the sub at all. Please help!

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Hello, First of all with these new Alpine amps everithing adjustable just about is digital, as well as the internal workings of the amp to a point. If you bought this amp new then check your warranty or take it back where you purchased it if you can. Check that your amp is getting an input signal from your head unit. Check your head unit sub output settings, something could have gotten turned off or down. On this paticular amp if there is a problem internaly it would let you know or go into protection mode. You say your sub has ben tested and is good, check again. Hook another speaker up to the amp. Unhook that speaker and try, you never know. Like I said, if the amp is'nt going into protect mode and the digital display is'nt telling you any types of faults then it has to be the input signal. Make sure you are getting a signal. That has to be your problem otherwise amp would be in protect mode. Let me know what you find.

Posted on Feb 12, 2009

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Power to amp no sound


Test your subs on another amp....If they are fine then try running different rcas in your car from the stereo to see if they are the culprit. If still no sound probably your output on your amp is gone.

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The amp should always light up showing you that it is powered and there will also be a red light that will light up if theres something wrong.Sounds like maybe the hot wire that goes to the amp isnt big enough to give the amp enough power.Check your positive wire and ground wire for tightness and make sure hot wire supply is big enough and also the ground wire is big enough and has a good ground.I hope this Helps you.Have A great day..

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1 Answer

I do not hear any music through my 10" M Audio Subs (M Audio Sound System)


If you know how to use a multimeter, you can test the amp this way:

-unhook the subs
-hook up a cheapie speaker you know for sure works to one of the channels
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-put the positive probe on the inside of the input connector, being sure you make contact with th inner contact
-take the negative probe and tap it on the outside of the connector

What you are doing is sending a low voltage (replicating an audio signal) into the amp audio circuit and allowing the amp to amplify it. If the amp makes the speaker pop each time you strike the probe, the amp is working.

You mentioned you need a 4 channel amplifier make the two, dual voice coil subs operate. The is not true and by hooking them up like that, there's a chance of damaging the subs. The reason is that the dual voice coils are interwoven and they have to get electrically identical signals or they fight against each other. The can mechanically fail, then, electrically fail, then even damage the amp too.

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