20 Most Recent Alpine MRD-M300 Car Audio Amplifier Questions & Answers


I have a alpine mrd-m300 amp and it will come on the voltage meter comes on and everything comes on i just get no sound to subs i hooked it up to another amp and it work just can get sound of of this

Make sure your safety mode is off. Go to mode 9 and ENT and make sure it is off. If it still dont work you proabably have bad RCA wre or speaker wire. Hope this helps!
4/22/2013 7:16:26 PM • Alpine MRD-M300... • Answered on Apr 22, 2013

Hi, I have a MRD-M300

That is a little strange, I would tighten up and clean up your ground and power connections, check your fuses.

Does the amp power up?

Amp being underpowered doesn't make any sense, unless he means that the wire was of too light a gauge to supply the amps demand, but typically that will cause overheating and the amp will click off.

Now over driving the amp can burn out the coils in the sub.

Check your subs by tapping a battery on the wire going to them and see if they move and make a pop, if so you are good.

Go ahead and check connections, fuses, subs and let me know what you find then we will attack the exact problem.

Let me know how it works out,


PS If I had a nickel for every bad ground I had to fix from shops around here I would make slightly more money every month!
2/4/2010 12:11:05 AM • Alpine MRD-M300... • Answered on Feb 04, 2010

It is not powering up. all cables are connected

check fuses, and rem wire
12/27/2009 3:12:32 AM • Alpine MRD-M300... • Answered on Dec 27, 2009

Powers up no sound out

Hello jreinhard623,

Check the speakers and wiring by substituting a known good speaker and check the amp inputs and RCA cables. Also make sure that the input gain and other controls are set properly. If there's still no sound, the amp itself is probably defective.
11/10/2009 12:30:06 AM • Alpine MRD-M300... • Answered on Nov 10, 2009

Same problem...I have the "---" message.

you need to make sure that you ground wire is no longer than 9 inches and a heavy enough wire for the wattage of the amp
9/11/2009 9:03:40 PM • Alpine MRD-M300... • Answered on Sep 11, 2009

My MRD-M300 amp will stop working when I turn the

There are a few things you should check:

Check that you have the correct fuse on your power cable. If it is allowing too much current, the protection feature of the amp will kick in. Similarly if the resistance is too high, there will not be enough current to power the amplifier.

You may also want to check the earth/ground cable to ensure that it has a good connection.

Try increasing the gain slightly on the amplifier (not too much or you will blow something). This will mean that you don't have to turn the head unit volume too high to get a loud output.

Nice amp BTW.
6/18/2009 3:53:17 PM • Alpine MRD-M300... • Answered on Jun 18, 2009

E-3 comes up

Hello svjonny13,

Excessive current draw can be caused by a short in the wiring, especially the output. Also, an amp may draw excessive current when operated into a lower impedance load than it can handle.

Too low of a supply voltage may result in the amp drawing excessive current, especially when operated at or near it's rated output. Voltage multiplied by the current equals watts. So if the amp is trying to produce X number of watts, the lower the voltage, the more current it needs. A power wire that is too small or too long may have too high of a voltage drop. A high resistance in the ground connection can also result in a significant voltage drop. Again, too small, too long, loosely fastened, or perhaps corroded. I'd check all wiring

Internal component failure can also cause excessive current draw. In that case, the amp needs service.

Hope this helps.
6/17/2009 4:18:52 AM • Alpine MRD-M300... • Answered on Jun 17, 2009

No sound from subs

No sound is produced. ? The output disable mode is turned on. ? Refer to the instructions at ?Output Disable Mode? to turn the output disable mode off.
6/10/2009 3:14:34 AM • Alpine MRD-M300... • Answered on Jun 10, 2009


The MRD-M300 has speaker-level inputs so you can easily use it with any car stereo. Hook it up and hear what good bass can sound like!
  • 150 watts RMS x 1 at 4 ohms
  • 300 watts RMS x 1 at 2 ohms
  • MOSFET power supply and output stage
  • STAR Topology for cleaner sound
  • Bass Engine® features:
    • low-pass digital crossover, 30-200 Hz, 24 dB/octave
    • variable subsonic filter (15-50 Hz in 5 Hz steps)
    • parametric EQ variable from 30-160 Hz
    • Bass Compensator enhances low-end definition
  • top-mounted digital control center with cover
  • time correction 0-10 milliseconds in 0.5ms steps
  • phase correction 0-180° selectable
  • digital readout
  • detachable front cover
  • blue power LED
  • delayed turn-on
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • speaker- and preamp-level inputs
  • gold-plated terminals
  • 8-5/16"W x 2-11/16"H x 11-1/2"D (10"D without front cover)
  • 1-year warranty
5/30/2009 12:12:09 AM • Alpine MRD-M300... • Answered on May 30, 2009

No sound is coming out

Hello christheline,

First make sure that the amp is powering up properly and that the input and subwoofer(s) are connected.

Check that the amp is not in "safe mode".

1. Press the MODE button.
Press the UP or DOWN button until “9” is displayed.
2. Press the ENT button.
3. Press the UP or DOWN button until “9-1” is displayed.
4. Press the ENT button.
5. Use the UP and DOWN buttons to turn safe mode ON.
6. Press the ENT button.

If this does not work, either the input from the head unit, the subwoofer(s), or the amp itself is probably defective.

Hope this helps.
5/29/2009 2:53:36 AM • Alpine MRD-M300... • Answered on May 29, 2009

Lights on, nobody home

Appears to be an issue with current. Is the speaker the correct impedance for the amplifier ? Have you confirmed there are no short circuits in the wiring ? I'm not familiar with this particular product,

The alpine catalogue gives recommended amp/speaker combos. If you don't have an aplpine sub, then look at the specs and find a similar one. You may be trying to load the amp too heavily and it will protect itself.
4/26/2009 2:57:38 PM • Alpine MRD-M300... • Answered on Apr 26, 2009

I need a manual for my amp any ideas on how i can

More power. get a 0 gauge power wire that will help. also try a gel cell battery as opposed to a liquid one. other than that if you really want more punch try buying a bigger amp. Or maybe the issue is not your amp at all it could be the subs you are running and the type of box. Not all boxes are intended for all applications.
3/10/2009 11:51:07 PM • Alpine MRD-M300... • Answered on Mar 10, 2009

My amp not workin

if the amp doesn't play anything but comes on you probably don't have an input signal try to get a different input signal
1/21/2009 6:14:52 PM • Alpine MRD-M300... • Answered on Jan 21, 2009

Led read out

E-3 The amplifier has been shut- down 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.
10/6/2008 8:40:43 PM • Alpine MRD-M300... • Answered on Oct 06, 2008

Alpine v12 md300mono

E-2 = ERROR 2; call Alpine direct at:
Audio Products Technical Support
(Alpine Electronics of America, Inc.)
(800) TECH-101 (1-800-832-4101)
8/19/2008 8:39:46 PM • Alpine MRD-M300... • Answered on Aug 19, 2008


7/29/2008 2:15:09 PM • Alpine MRD-M300... • Answered on Jul 29, 2008
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