Question about Alpine MRD-M300 Car Audio Amplifier

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Hi, I have a MRD-M300 (99% sure) hooked up to 2 10" subs. Got them installed at Circuit City maybe 5 years ago, they said it was a fine set up. Bass stopped coming out around xmas so I took it into a local shop to be diagnosed. He said the whole amp was blown because it had been underpowered. Q: Wouldn't it have been blown sooner than that? And can it be fixed or is it kaput? Thanks!

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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,

Thanks!

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!

Posted on Feb 04, 2010

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This really depends if your 10" subs are 4 ohms each or 2 ohm - for this exercise, I'm presuming they are 4 ohm each.

You already know your amp can deliver 600W RMS (@ 2ohm), so you need to be careful you do not exceed the maximum RMS input power of your subs.

Normally you would wire subs in "parallel", which would reduce the circuit load to 2ohms - however, the 600W RMS power may be too high for your subs to handle.

In this case, it may be safer to wire your subs in "series" - this will increase the circuit load to 8ohms, which will effectively decrease the amps RMS power output.


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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!
Details:
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  • 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
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  • detachable front cover
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  • delayed turn-on
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  • 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

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