Question about Alpine MRD-M605 Car Audio Amplifier

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Mrd-m605 troubleshooting\ my amp will light up but mo sound and there is one setting that will not chahge off of off and it dont do anything any hints on this

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Yeah, how about you give us more info please.

Posted on Nov 02, 2006

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Posted on Jan 02, 2017

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I have a comp s 12 2ohm kicker and a comp vr 12 dual 2ohm kicker how do i wire these to stay at 2ohms to the amp


you can wire them to be at 2ohm load you need two of the same speaker. its is very bad on the amp to run like that and you will not get a good bass sound because one will over power the other sound wise

Mar 23, 2013 | Alpine MRD-M605 - V12 MONO AMP 600WX1 RMS...

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I have power at the amp and no sound. Herts just climb, no setting. Alpine MRD-M605.


If you mean you hear low frequencies in the begining and continues to rise in frequencies then it sounds like you may have a shorted power supply. First make sure your ground is ok. Also make sure the signal from your head unit is not the problem with the noise. Does the amp power on? If amp does power on and head unit and all connections to amp are fine then either the power supply or something in the output stage is shorted. Could be a diode, capacitor, resistor, or transistor or an ic chip. Let me know if amp powers on and this problem happens. I repair amps for a living, i'm the cheapest you will find anywhere. If interested send me a private message.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_b53a7494531bf96d

Aug 23, 2009 | Alpine Car Audio & Video

2 Answers

I have an Alpine MRD-M605 amp that recently has started having issues. My subs only produce sound when my deck is turned up full blast. The setup had been working for over a year with no problems. The subs...


If your deck is aftermarket; Does it have a dedicated Subwoofer output? if so, check the control in the deck (sub gain). If you are using a factory radio, and a high to low level adapter (speaker wires to RCA), it may be bad (not too uncommon) or check your fader front/rear any difference? Otherwise, you have one of two problems. A bad preamp in the deck or a bad pre amp in the amp. Both are fairly uncommon. More than likely it's a setting. Hope this helps

Jun 23, 2009 | Alpine MRD-M605 Car Audio Amplifier

1 Answer

CUR display


Hello yte1771,

You can download the manual from Crutchfield.

The "CUR" display is an indication of excessive current and is most likely caused by too low impedance or a fault in the wiring or the amp itself. It's probably not your cap.

Hope this helps.

May 18, 2009 | Alpine MRD-M605 Car Audio Amplifier

1 Answer

AMP POWERS UP, I CAN HEAR IT WORKING BUT THE SOUND IS REALLY REALLY LOW...


Hello korre,

Low output could be the head unit, the speakers of the amp itself. Start by isolating the problem.

1) Test the sub(s) on a known good output.
2) Input a known good signal. A portable with RCA preamp outs will work OK.
After you have eliminated the other components, troubleshoot the amp itself:

1) Check the onboard fuses. The M605 has 2 each 30A fuses just to the left of the power and ground terminals.
2) If it was just installed, then my first suspicion would be a problem in wiring. If one tiny little strand of your speaker wires comes into contact with another wire or ground point, it could present just enough of a signal path to ground out most of your power, and perhaps still allow the amp to seemingly operate normally (at least for awhile). Check power and ground too.
3) Make sure your head unit RCA's are plugged into the inputs and not the outputs.
4) Check the low-pass and subsonic filter settings. If low pass is turned all the way down, the amplifier would ONLY send frequencies below 30Hz to the speakers. Subsonic turned on and the low pass all the way down would effectively result in no sound.
5) Remove the top cover to access the mode controls and display. Check the input level.

If everything checks out, the amp probably has a defective component and needs factory/service center repair.

Hope this helps.

May 06, 2009 | Alpine MRD-M605 - V12 MONO AMP 600WX1 RMS...

1 Answer

CUR on alpine MRD M 605


check your ground and make sure you battery power is connect properly

Apr 14, 2009 | Alpine MRD-M605 - V12 MONO AMP 600WX1 RMS...

1 Answer

Alpine amp mrd-m605


The amplifier probably has shorted output transistors. If the amp gives the same error message with the speaker wires disconnected from the amp, the amp needs to be repaired.

Dec 30, 2007 | Alpine MRD-M605 Car Audio Amplifier

1 Answer

MRD-M605 current protect mode


Well You should make sure that the ground is good, and that no moisture got into the unit. I would suggest getting a schematic and testing to make sure that the voltage levels were correct on the unit. and the do a signal trace to see where the audio signal discontinues.

Sep 07, 2007 | Alpine MRD-M1000 Car Audio Amplifier

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