Question about Rockford Fosgate Punch P5002 Car Audio Amplifier

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Cutting out I have a p500-2 and it is bridged for some reason when I hit my brakes the amp seems to fturn off. sound is great when it is working but really pisses me off when I stop at a red light. send help please...

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Hmm.. this sounds to me like you have your amp connected through your fuse box.. if that is the case, you most likely have it fused in with your brake lights.. you definitely need to have that amp running a direct line with inline fuse to your battery, directly.

Posted on Oct 20, 2008

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JL Audio Amp. My amp all of the sudden started cutting in and out. It's an older amp and I've never had issues with it before. I've checked all the wiring and the fuse it all seems fine. Any...


you need to determine what impedance the amp is running at ,how many spekers ,most 2 channel amps will only run 2 4 ohm subs per channel and only 1 4 ohm speaker in bridge ,Basically if you have 2 4 ohm speakers bridged at the amp it will usually cut in and out .Some amps will not do this for a while and will work for a while at low impedance but once they get older and hot and cool off many times they will then only work for the intended ohm load ,Do you have 2 speakers ,if so make sure 1 is on left channel and 1 is on 2nd channel (should not cut off ) if it is a mono amp ,make sure you are only running 2 4 ohm subs and not dvc speakers (these will run 1 ohm and shut the amp down ) there are ways of wiring more speakers or dvc speakers ,I can explain but I need to know what product you have .

May 07, 2012 | Car Audio & Video

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What does it mean when the red IND PROTECT light is on? my subs cut in and out, mostly out with the occasional hard hit popping up in the middle of a song. Whats wrong?


You've got the gain to high and the amplifier is clipping the sound frequency causing it to distort. Possible problems are you have a bad speaker(s) and the reading is below 4 ohms. Each of the 4 channels can only take 4ohms. If your bridging 2 speakers to this amp you have to also make sure you are only bridging 4ohms anything lower will cause the amp to overheat. Dont put 2 speakers in parallel on one channel or you will definitely have more problems.

Apr 07, 2010 | Pyramid 1000 Watt 4 Channel MOSFET...

2 Answers

My subs cut out everytime I hit a bump.


I would say the wiring, in particular the earthing for it, also check any "Compression" fixtures.and check ALL joints etc. To be sure give the actual Amp a gentle tap, and see if that brings on the fault.

Feb 21, 2010 | Rockford Fosgate Punch 401S Car Audio...

1 Answer

My infinity reference 7540a amp cuts in and out with heavy bass when the ''loud'' feature is on. I redid my ground, remote wire, shortened my power cable, and double checked all speaker connections. I dont...


sounds like ur gains are set to high and is going into protect mode

also what ive seen happen before is the speakers (if mounted in metal shelf or door and arnt bolted down correctly can flex under bass notes and flex the speaker that much the termanls short onto the metal and amp hits protect mode
(rare but worth a look if you think u have elimanted most other things Had a dude come to me when i was working in sydney with this problem )

also could be things like clipping protection , overheat protection ,amp drawing to much current from the alternator

do your lights dim when you hit the bass notes ?

get back to me and im sure we could solve this problem

Jan 22, 2010 | Infinity Reference 7541a Car Audio...

1 Answer

Amps on woofers are fine just won't hit


your probably making your amp run to low ohms if its a 2 channel amp bridged to one channel you can probably only run it at four ohms

Also seeing as your subs are 2ohm dvc you can't wire them individually to 2ohm and use each channel separately. So i'd recommend buying a 2ohm stable monoblock or running it at four ohms. a 1400 watt amp'll still pound at 4ohms and it'll extend your amp's life span

Aug 29, 2009 | Pioneer GM-7200M Car Audio Amplifier

1 Answer

Mtx blue thunder 752 pro


When you bridge amp they some time double in power output into a certain load. If the actual load of your speakers are lower than the required bridged load the out put of the amp will proportionally try to increase again. You have to match your loads to the specs of your amp. Use your manual to see what is required, then use ohms law, for adding resistors in series/parallel to make your speaker load match. For more info please reply.

Nov 21, 2008 | Car Audio & Video

2 Answers

Bass sounds flat when volume is increased


probably your power is too short, increase your gauge wire, and your ground wire of the amplifier has to be shortly as possible, and the positive has to be enough to support peak power, you can also put a big capacitor on the positive wire to give some more power while the bass peak.

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1 Answer

Power & protect


my amp says Lo on the digital circle on top of the amp i have a mtx 9500 bridged to the amp and it cuts out at high volumes and suddenly please help



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