Question about Alpine MRP-M450 Car Audio Amplifier

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I got Alpine MRP-M450 which has three nobs on the side. (1) Gain (2) Bass EQ (3) Filter. The Gain works fine but Bass EQ and Filter nobs are keep spinning when I try to tune. I checked with an Autoshop and they said it's broken and you need to replace the part. Can someone help me?

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SOMETIMES THE KNOBS THEMSELVES GET STRIPPED OUT AND THE CONTROL POTENTIOMETERS ARE FINE. YOU WILL HAVE TO INSPECT THIS TO DETERMINE WHICH IS AT FAULT. IF THEY ARE NOT STRIPPED, BUT CONTINUE TO TURN AROUND AND AROUND, THEN THE CONTROL POTENTIOMETERS ARE AT FAULT. LOOK NEAR THE CONTROLS ON THE PC BOARD AND YOU SHOULD SEE THE LOCATION NUMBERS PRINTED ON THE BOARD ITSELF. SEE BELOW FOR THE LOCATION AND PART NUMBERS:
VR101 18E39146S01 VOL,ROTARY 50K
VR102 18E39147S01 VOL,ROTARY 5K
VR103 18E39145S01 VOL,ROTARY 20K
YOU CAN OBTAIN THESE FROM PACIFIC COAST PARTS AT 800-421-5080, BUT YOU NEED TO HAVE SOMEONE QUALIFIED TO REPLACE THEM AS YOU WILL HAVE TO TOTALLY DISASSEMBLE THE AMPLIFIER AND ALSO HAVE GOOD SOLDERING SKILLS. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE....V

Posted on Jan 06, 2010

Testimonial: "First of all, thanks for your reply. I will check the part# and see who can do the smart soldering. Thanks :)"

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When the bass cut on the speakers cut off


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the amplifier may be over-driven. are there red protection lights coming on the front panel? Or a loose wire - power, ground, or speaker.

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its not the wiring, if the wiring was insuficient, it would just melt...

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Sounds like it is getting too hot and a thermal overheat protection switch is shutting it off. Check to make sure your gain isnt over 3/4.

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Hi SPDGOD,

 

Could not find exact, but close manual.  It is the MRP-M450 mono block amp from alpine.

 

Go to this url and view in Adobe. Print it if you need to

http://vault.alpine-usa.com/products/documents/OM_MRP-M450.PDF

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


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.

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