Question about Rockford Fosgate Punch P4004 Car Audio Amplifier

1 Answer

Spontaneously shorted, now blowing fuses on amp too.

About 2 days ago I got in my car and noticed that my two RF 10" subs were not hitting (this after almost a year of working well)(I don't know if this could have anything to do with it, but its been about 0 degrees here for a week or so and during that time I'd get a small audible pop from the back sometimes). I could get a few random bumps out of them if I cranked it up pretty high, but other than that nothing. I checked out the amp and when the volume is low, the emblem stayed lit (faded when the bass should have hit, then relit) but no sound from speakers. When I cranked it up, it would hit hard for a second then go into protect mode for a few seconds. At first I thought it was one of the subs because when I unhooked it, the other bridged channel & sub would work fine. But, I checked the resistance through the connectors for all 4 channels of the amp and one channel came back funky (the readings kept going up and up), not like the other 3 channels that all read someting like 4.35 ohm. That was the first problem. Next, I tried to hook it back up and now everytime I turn it on it blows the amp's two onboard 30amp fuses. I am using the same power lead and ground that was connected for the last year. When I removed the cover of the amp could I have screwed it up? I just used the ohmeter a couple places. Maybe something happened when I connected the power back to it? Is there a fix? or way to test for a fix? Time to get a new amp?

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  • Ryan Harris Feb 22, 2007

    Its a P4004 4-channel amp bridged to run two 10" Rockford Fosgate single coil subs.

  • Ryan Harris Feb 26, 2007

    Well, thanks for the input,not what I was hoping to hear, but good to know. Do you think its cost efficient to get this fixed or just to start shoping for a new one?

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Time to go to the repair shop. Sounds like you have a blown amp. Good luck.

Posted on Feb 22, 2007

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For example;
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