20 Most Recent Alpine MRP-M450 Car Audio Amplifier Questions & Answers

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Only get sound wen rca's r in halfway

You have a bad set of RCA's. Try and get a pair specifically made for car audio. There are hundreds of brands, usually the cheap ones work fine.

What usually happens is on cheap RCA cables, wires inside the actual plug split apart and short out on one another. Get another set of cables and you'll be fine.
5/17/2021 6:38:11 PM • Alpine MRP-M450... • Answered on May 17, 2021
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2answers

I removed the remote wire

the remote wire might have touched ground... make sure you still have voltage on the remote wire with the radio turned on....another test is jump the main red wire to remote also..
11/25/2014 6:32:11 AM • Alpine MRP-M450... • Answered on Nov 25, 2014
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I have a 900 watt amp wired to 2 mtx 12's. it powers up fine but when the bass hits the power light fades away

Try using a 4ga ground cable. Ground it to the frame of your car. And use a 2ga and a inline fuse 100amp run this to your battery. And you need a cap. A 1000 watt will work good. Hope this helps....
2/8/2014 3:27:14 AM • Alpine MRP-M450... • Answered on Feb 08, 2014
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Remote wire touched ground wire and stereo turned

may have to check fuse might be low or find a better ground area to place ground cord at
10/31/2013 11:01:11 PM • Alpine MRP-M450... • Answered on Oct 31, 2013
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2answers

Alpine amplifiers fade in and out durring high volume bass hits

main problem i think you are having is your loosing power when it kicks a note.. get a power cap! power caps feed your amps constant power! this will solve your problem :)
7/25/2010 12:51:54 PM • Alpine MRP-M450... • Answered on Jul 25, 2010
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I got Alpine MRP-M450 which has three nobs on the side.

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
1/6/2010 4:13:40 PM • Alpine MRP-M450... • Answered on Jan 06, 2010
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Wheres the power.. No bump

it might be that your subs are too powerful for the amp, check the model of the sub or subs online and check out how many watts they can take, because you might need to upgrade your amp or downgrade your subs
7/6/2009 6:56:45 AM • Alpine MRP-M450... • Answered on Jul 06, 2009
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Alpine mrp-m450 Amp won't stay on

im having the same problem with my amp, I took it to best buy and they said the amp was recieving power and recieving signals from the deck and i had everything hooked up right but that in the circuit board all the connections were blown, meaning i have a blown amp, i hope this isnt your problem but it definetly sounds like it. GOODLUCK
7/6/2009 6:46:23 AM • Alpine MRP-M450... • Answered on Jul 06, 2009
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Amp light is on but doesn't put anything out to my subs

if you are sure its the amp. the problem is internal. but if your not sure, try a different stereo or source of sound to the inputs of the amp. if there is still no sound than it is the amplifier and it could be a number of things.
7/6/2009 6:34:02 AM • Alpine MRP-M450... • Answered on Jul 06, 2009
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2answers

Amp light flickering

do you have a capacitor its like an extra battery, if you turn the volume way up with cvr's pullin big power, it cuts out because theres not a steady flow of power.... hope this helps
7/4/2009 5:28:24 AM • Alpine MRP-M450... • Answered on Jul 04, 2009
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Can't get my amplifier to work.

My homie had the same problem with his escalade they adapted an rca line adapter from the factory wiring to geta signal to his amplifier and it just wasnt hitting like it should so we installed a new deck and plugged the rca cords right into it and boomboom pow it was hittin like a champ-we figured that the stock premium system that was incoprporated into the truck had some sort of an onboard amp that was filtering the bass from the door speakers and which was limiting the bass output to the rca adapter and thus on down the line to the amplifier- so maybe ya might want to look into getting an aftermarket deck and see if that helps your cause-good luck
5/21/2009 9:40:42 PM • Alpine MRP-M450... • Answered on May 21, 2009
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I am looking for schematics to the mpr_m450. My

Hello slinger_101,

Even though schematics are not usually provided for car audio amps, the manufacturer would need to have them available to perform repairs. It's possible that they may send you a copy.

I'd try contacting Alpine USA direct and see if they would email a PDF. Here's the toll-free phone number: Audio Products Technical Support
(Alpine Electronics of America, Inc.)
(800) TECH-101 (1-800-832-4101)

If that does not work, you may have to send it to Alpine for repair.

Hope this helps.
5/4/2009 5:49:01 PM • Alpine MRP-M450... • Answered on May 04, 2009
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Power turns on briefly

Sounds like a protection problem. A relay may be stuck, or there really may be an internal problem you cannot see. Take it to a shop to have it bench tested independent of your vehicle.
12/22/2008 5:31:31 PM • Alpine MRP-M450... • Answered on Dec 22, 2008
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When the bass cut on the speakers cut off

220 watts RMS x 1 at 4 ohms (400 watts RMS x 1 at 2 ohms)
the amplifier may be over-driven. are there red protection lights coming on the front panel? Or a loose wire - power, ground, or speaker.
12/22/2008 5:29:45 PM • Alpine MRP-M450... • Answered on Dec 22, 2008
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Not enough bass

its prolly the deck, did you try turning the alpine's input gain controls up...

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

you might also see if you could adjust the bass frequencies or crossover frequency, the crv might just have a different resonant frequency then the rav 4
5/17/2008 10:22:14 PM • Alpine MRP-M450... • Answered on May 17, 2008
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My Alpine m450 amp light is on but no sound

make sure your RCA's are plugged into the input and not the pass through
4/6/2008 5:15:53 PM • Alpine MRP-M450... • Answered on Apr 06, 2008
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