Question about Alpine MRD-M301 Car Audio Amplifier

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Amp displays the letters curr

Amp is stuck in protect mode after negative speaker touched the outside of the amp

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? The amplifier has been shutdown due to excessive current. ? Find and eliminate the cause of the excessive current, then turn the power off then back on from the remote control unit. ALPINE ELECTRONICS OF AMERICA, INC. 19145 Gramercy Place, Torrance, California 90501, U.S.A. Phone 1-800-ALPINE-1 (1-800-257-4631)

Posted on Jun 10, 2009

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Have you disconnected all inputs and outputs on amp and retried starting it power only? if so your amp has an internal solder bridge and must be repaired by authorized repair center. Repair it or replace it at wholesale price from www.godspeedaudioheaven.com

Posted on Feb 06, 2009

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1 Answer

It is stuck in protect and wont come out


bro...i had problem like that before and i found out that the load(speakers) was high thats why the fuse always blow...or...check the wire to the speakers if they are sorted or touched.gud luck

Oct 26, 2012 | Rockford Fosgate T1000-1bd - 1000W...

1 Answer

Sony STR-DE925 stuck in protect mode


there could be electronic components failure



• need to open the unit

• get a multimeter and measure the DC voltages present on

each of the amplifier output stage.

• it should be no more than 0.7 V, if it s, remove those pair of power

transistors and test again for output voltages.


the negative probe

of the multimeter to the chassis of the unit.


• if the protect problem goes out,

assume one of the extracted pair is bad.


you can test it individually since it is already outside the circuit.


Let me know how you make out with the inspection.

It is a good chance you will find something.


hope this helps, thanks for using Fixya!

Aug 07, 2012 | Sony STR-DE475 Receiver

2 Answers

My Harmon kardon is stuck in protect mode


Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Double check all connections .A thumbs up would be greatly appreciated if this answer is helpful to you. Worth fixing.

Nov 19, 2011 | Harman Kardon Audio Players & Recorders

1 Answer

I have a JBL GTO 7001, it switches in an out of protection mode. i pulled out the amp, an noticed that the positive wire from the speaker was pulled out. so i disconnected the power scorce an reconnected...


Make sure that your positives and negatives are lined up correctly. This happened to me during my latest install and the problem was I had one positive speaker wire plugged into a negative speaker terminal. This switches the amp on after a few seconds and then back to protect mode once it detects a faulty speaker wire. Hope this helps!

Oct 07, 2010 | JBL GTO7001 Car Amp

2 Answers

PROTECT DISPLAYED ON RECEIVER


This generally means you've got a short somewhere, and the received is trying to protect itself.

My suggestion is to disconnect all of your speakers at both ends, and reconnect them.

Most times this happens because a speaker wire is lose, and the positive and negative connections are touching each other, causing it to short out.

Mar 24, 2009 | Sony STR-DE485 Receiver

1 Answer

My CA9 has protect recurrent problems.


if you are bridged in parallel instead of in series the amp wont support the load so it turns the power protect on till the amp cant handle nomore then the amp will go if you have two subs bridged run them left speaker possative to to the amp possative for bridged mode then laft speaker negative to the right speaker possative then right speaker negative to your amp negative for bridged mode if you have them left and right speaker possative to amp possative and left and right speaker neggative to your negative to your amp thats parallel the ampwont support the 2 ohm load

Feb 08, 2009 | Crest Audio CA9 Car Audio Amplifier

1 Answer

CUR is showing on the display


The amp will reset when you cut the power off to it. Disconect bat for 30 sec and reconect. But to be honist with u if the wire jumped out and grounded some how during a high level, there is probley internal damage done.

Oct 17, 2008 | Alpine MRD-M605 - V12 MONO AMP 600WX1 RMS...

3 Answers

Only one sub works


The amp should produce no output when using the left negative and the right positive.

If the amp works bridged (left positive and right negative) with one speaker AND works when you connect one speaker from the left positive to the right positive, it would appear as though the right channel isn't getting any signal.

Try inserting only the left signal cable (nothing plugged into the right RCA jack) to see if the right channel will work when a speaker is connected to the right channel speaker terminals.

Jun 30, 2008 | Sony XM-2002GTR Car Audio Amplifier

2 Answers

Negative speaker output touched chasis of amp.


check all fuses on the unit, pull them all.
look for a way of resetting the amp.

LEAVE THE MAIN FUSE OUT TILL THE INSTALL IS COMPLETE!!!

that way you wont short a screw driver across the terminals on to the chasis.

Dec 11, 2007 | Alpine MRD-M301 Car Audio Amplifier

4 Answers

Amp switches off at about -10db volume level


I suppose that on all speakers connections + (positive) is on +, and - (negative) is on - ?

Oct 08, 2007 | Yamaha HTR-5830 Receiver

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