Question about Rockford Fosgate Punch P4002 Car Audio Amplifier

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Rockford Fosgate P4002

Left channel problem, the speaker when hooked up, peaked to full excursion. amp turns on just fine and right channel works great. Possible output transistors shorted?

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Re: Rockford Fosgate P4002

Yes they are ! And that means the DC is on the speaker and will for sure damage the speaker if it already hasent

Posted on Jun 15, 2007

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Rockford Fosgate P500-2 is capable of delivering 125Watts to 2 channels @ of 4 Ohms speakers, and 250Watts to 2 channels @ of 2 Ohms speakers.

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Hey i have looked over many rockford manuals,(i own a 300.1 my buddy owns a 325.1) and for there mono(.1) amps there hooked together on the inside so channel A+ and B + are cencted on the inside the amp. So you ither hook one 2ohm sub to channel A or you can hook 1 4ohm subs to channel A and 1 4ohm sub to channel B. There 2ohm stable so any lower will eventualy burn the amp out.

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If you didn't find any burned parts that would mean one of the buffer amplifiers before the power amp could have died. They could either be transistor based or opamp based. They are fairly low power so they will not explode like the output transistors like to do. Contact rockford, they should be able to send you a schematic. Let me know I will try to help you through it.

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I was given a rockford fosgate 500x 4 channel amp and the rear 2 channels work fine but the 2 front dont when i hook up the speaker the speaker bottoms out and stays like that until i unhook the speaker...


Sounds like those two of the channels are blown. There is really nothing that can be done about that other than having an expert repair it. You might as well buy a new one tho, or just use it as it is.

You could look at all the fuses in it, make sure there not blown (they will be black and the little metal piece inside the plastic will be broke or cracked)

Post back if you have any further question's and comments. Thank you for choosing Fixya!

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Hello jmanbutt99,

The old Rockford-Fosgate was probably producing the rated power. The Sony is most likely overrated. But, it's supposed to be stable on each individual channel down to 2 ohms and will deliver 65 watts RMS into that load. So to get the most from it, your best bet would be a pair of 4 ohm speakers paralleled to each channel. A relatively efficient speaker like the Kicker 07DS600's shown here should provide pretty good sound.

These will work with as little as 6 watts RMS and can handle up to 50 watts RMS so the Sony should power them really well. They're 4 ohm so a pair in parallel will present a 2 ohm load.

Hope this helps

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Connect rockford fosgate amplifier & speaker together

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Hello desperate2le,

Watts delivered is a function of the voltage times the current. If the amp was 100 percent efficient, it would need 33 amps at 12V for 400 watts. At 14.4V, it would only need 28 amps. Of course, amplifiers are NOT 100 percent efficient, only about 50-60 percent in many cases, but somewhat higher for monoblocks, maybe 80-90 percent. So you're looking at a fuse in the 60-80A range. In the absense of a specific fuse size from the manufacturer, I'd start the primary fuse at a 60A and if the amp blows it on power up/immediately/frequently, move up to an 80A.

All of the Rockford-Fosgate 2-channel bridgeables I've ever seen show using the left positive (+) and the right negative (-) for bridging. But if it's not shown right on the amp, I'd call or email RF for the correct connection. The new amps do show it.

Hope this helps.

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