Question about Alpine MRP-M450 Car Audio Amplifier

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When the bass cut on the speakers cut off

The amp is hooked up right but the speakers cut off when the bass is on

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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.

Posted on Dec 22, 2008

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My radio cuts out when i turn it up and the bass hits on my subwoofer


You are drawing to much power to the amp. I assume that there is no dedicated power fron the battery to the amp. If there is you should look into a capacitor

Feb 13, 2013 | Car Audio & Video

1 Answer

My amp won't play bass everything is hooked up


I have a similar problem with my 2012 civic, I hooked up my 1800w kenwood mp to my 2 12" w6s and 1 song plays and sounds great, the rest of my songs have no bass from the subs, just the car speakers sound normal so I dont know what the hell thats all about. I thought it was a wiring issue but I can play the one song all day and it sounds perfect so any suggestions? thanks in advance

Jan 29, 2012 | Sony Car Audio & Video

1 Answer

They also try to play the bass


a crossover cuts the certain tones out of the sound.example: the high side cuts out low and mid tones,or the mid side cuts out high and low. The only problems this could be is that the crossover is not set right or not wired right. These speakers should be plugged into the high side of the crossover. If wired right and set right then your crossover is no good.

Mar 23, 2010 | Kicker KS13 Car Tweeter

1 Answer

I have a BMW 318i 1993 and when i got it there was a big speaker and amp hooked up. I unhooked it but now i cant get any sound....the radio lites up but no sound. i know speakers work cuz they worked...


Hello pinkpimpin20,

Without knowing exactly what modifications were made to the factory sound system, it's difficult to point you to a particular fix. The number of channels on the "big amp" that you disconnected would help. Even the make and model.

But, from your description it's possible that the previous owner installed a multichannel amp to drive both the "extra bass speaker", usually referred to as a subwoofer, and the original vehicle speakers. In that case, the speaker wiring from the head unit (receiver) was cut and the receiver side of the wires was rerouted to the input of the aftermarket amp. The output of the amp was then connected to the other ends of the speaker wiring.

To restore to the original, you need to pull the stock receiver and resplice the wiring. If the previous owner cut the plug completely, it may be necessary to purchase a replacement from your BMW dealers service or parts department. It's possible, but not likely that the previous owner used both an aftermarket "harness" and an aftermarket "reverse harness" to avoid having to cut the wiring. In that case, all you'd have to do would be remove them and plug the radio harness back into the vehicle harness (or the back of the radio). But most DIY audio enthusists don't mind butchering the vehicle wiring. And you'll probably find that electrical tape was used to secure the wiring. After a year or so under the dash, it'll be a sticky mess to unravel.

The speaker wiring colors for the '93 318i are as follows:

Left Front Speaker Wire (+): Yellow/Red
Left Front Speaker Wire (-): Brown/Orange
Right Front Speaker Wire (+): Black/Red
Right Front Speaker Wire (-): Brown/Orange
Left Rear Speaker Wire (+): Yellow/Black
Left Rear Speaker Wire (-): Black/Orange
Right Rear Speaker Wire (+): Blue/Black
Right Rear Speaker Wire (-): Brown/Orange

Hope this helps.

Sep 24, 2009 | Jensen Car Audio & Video

1 Answer

Speakers cut off when bass goes up


probably the amp going to safe or protect mode judging by the fact that you have 3 subs wired to it i would say it is not 1 ohm stable try disconnecting 1 sub and see if it still happens this will be running a 2 ohm load rather than 1 if it stops happening then you need to figure out a better wiring configuration that will work with your amp.

Jul 03, 2009 | Kicker ZX400.1 Car Audio Amplifier

1 Answer

Bass not plaing only the small speakers, do i have it hooked up right?


I'm having the same problem, bass will cut out randomly everything is plugged in correctly if you bump the subwoofer it seems to come back on for a bit then back off, did you ever find a solution for this?

May 23, 2009 | Logitech Z-560 Computer Speakers

1 Answer

I bought a 500/1 jl audio amp and also a w7 10 sub


if its cutting off and right back on then check your ground and your power wire makes sure both are connected good and none of your fuse's are blown, either that or you got a wire hooked up backwards in the sub.. but my guess is that the sub is hooked up wrong... that sub should be hooked up in a series or in parallel,

ok if your running just one speaker, it should be hooked up like this and 2 speakers are a different way...

this is parallel :pos to pos , neg to neg, then one wire coming from pos on sub to pos on amp then neg on sub to neg on amp but bridge the amp on your amp should be 2 pos and 2 neg in two different channels take the pos off the sub into the pos on 1 channel and then the neg from sub to the neg on the other channel,

this is series : on the sub it will go pos to neg then the other neg and pos will go to the amp, but make sure the pos and neg r on different sides of the sub, dont hook them both to the same coil

if your need more help give me your email and ill send you a pic of how to do it...


Aug 12, 2008 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

Hooking up a new 8" woofer speaker to my amplifier


If I'm reading the amp manual right, you should be able to connect the amp in 3 channel mode. To do this:
  • Connect both left door speakers in parallel to Ch A Left.
  • Connect both right door speakers in parallel to Ch A Right.
  • Bridge Ch B and connect it to the new 8" sub.
  • Set the Ch A LPF/HPF to HPF.
  • Set the Ch B LPF/HPF to LPF.
This should allow you to run all 4 door speakers and the sub from the amp. It will also automatically route non-bass to the door speakers and "only bass" to the sub.

Mar 22, 2008 | Pioneer GM-6300F Car Audio Amplifier

1 Answer

J/l 500/1 amp


I'd lay you odds that you are driving the wrong speaker impedence and that you may have damaged the amp. This is most often true when you improperly bridge into the wrong load. If you are lucky enough to not have damaged the unit then you need to get your speaker load right at once before you fry it, if you do indeed have the wrong speaker load (too much).

Jul 28, 2007 | Jl Audio 500/1 Car Audio Amplifier

1 Answer

Amp and sub bass playing through all speakers


You need to go into the setup menu and find out if the radio has a sub low-pass filter that redirects the bass to the pre-out for the subs, and away from the main speakers. Fiddle in the audio menu.

Apr 15, 2007 | Xtreme Sound WMS336 CD Player

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