Question about Alpine MRP-M450 Car Audio Amplifier

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The light on top on my MRP-M450 blinks and the amp doesn't work

I just hooked this up in my car...I had it in my truck previously with a dual voice voil sub at 2 ohm load, and though it's a different sub in the car it's still a DVC at 2 ohm load. I literally just wired it, and turned the stereo on. It started working fine, and I was adjusting the LP filter, Bass EQ and Gain knobs, and there was a popping sound and the sub cut out. When this happened the power light started blinking too...it's lit but it just seems like an intermittent blink or cutout of light. I didn't have the stereo turned up nearly as loud as I previously have in my truck, so I'm not really sure what I could have done wrong. I took the back cover off of the amp and nothing seems burned...what else can I check?

Posted by Anonymous on

  • Anonymous Oct 01, 2007

    The sub is fine, I hooked up my roomates Kicker amp and the sub sounds great. My multimeter shows it at 2.1 ohms...thats pretty close to the 2 it's suppossed to be, and if I push on the cone it reacts normaly (resistance goes way up and down as the cone moves).

    What should I check next? I appreciate the help.

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Anonymous

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Well if you took off the cover on the amp and nothing seems to be burn't, check the voice coils on the sub. It's possible the voice coils have separated and is causing the amp to short it self out due to ground error. If that doesn't help let me know and I'll tell you the next step.

Posted on Oct 01, 2007

  • Anonymous Nov 19, 2007

    There are also the internal crossovers inside the amp. Use your meter and check and see if the resistance is the same on each one of the prongs. They are small black boxs that are attached to the board it self usually on the side on the board held down with metal plates. If the resistance is not the same they are bad.

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