Question about Rockford Fosgate Punch P450.4 60W x 4 Car Amplifier Car Audio Amplifier

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I got a punch 450.4 car amplifier that a friend gave to me that is stuck in protect mode. he had it pushing two kicker L7 4 ohm dvc subs. is it fixable and if so what would i have to do to fix it?

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Capacitors are blown on the output side most likely. That amp isn't made for subwoofers. It will cost about 100 bucks plus shipping to send it to a competent electronics shop that has the ability to to that. If you are handy with a soldering gun, you have open it up and look for blown capacitors and replace them yourself. They sell them all at Radioshack.

Posted on Mar 25, 2011

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1 Answer

My kicker amp zx1500.1 keep going in protection mode I unhooked the sub speak wires and put the ACR cords back in and it didn't go in protection mode what next


Check ohm reading of the speaker. Should read close to whatever the spec is (2 ohm, 4 ohm, 8 ohm) if you have multiple subs and no ohm meter then try connecting one at a time to the amp. Either you have a shorted sub, ohms are too low for the amp or you have an (least likely) amp problem tha y only shows up under a load.

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That amplifier is only rated at 150 watts at 4 ohms, or 300 watts at 2 ohms. Not a very strong amp to run 2 kicker comps. My guess is you have the subs wired wrong for your application. There are 2 types of subs, one is a dual 4 ohm, and one is a dual 2 ohm. Most people bridge these coils together and that cuts your ohms in half. For example. Lets say you have the 10cvr104 subs. Thats the dual 4 ohm sub. You wire the coils together in parallel, now its a 2 ohm sub. You have 2 of these subs running off of your amp, if they are hooked up in parallel, now you have a 1 ohm load, out of the amplifiers normal operation. Your amplifiers internals heat up really quick and there is a thermal overload, putting your amplifier into circuit protection mode. My suggestion for wiring your subs is as follows: for each speaker, wire the coils together like this- positive coil1 to negative coil 2 and negative coil 1 to positive coil 2. That is called running in series, and doubles your ohm load. Next, we need to wire the speakers together properly to hook up to your amplifier. For this, since the coils are hooked together, you only need to use one set of terminals from each sub. And take the positive from sub 1 and hook it to positive of amp. Take negative sub 1 and hook it to positive of sub 2. Take negative of sub 2 and hook it to negative of amp.

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Then you have found your problem. It's internal on the amp. Protection circuitry issue. Have it Benched at a shop with the same impedance you are running it at. If it benches ok, check your ground, it should be no longer than 18" and go directly to the floor frame, not a seat bolt. You should also be running at least
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This will net a 1 ohm mono load for your amplifier.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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1 Answer

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1 Answer

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Hello moore_broder,

Your MTX 7801 is stable at 1 ohm, but you cannot wire a pair of DVC 2 ohm subs to that impedance. They can only be wired to 1/2 ohm which is too low or to 2 ohms.

Series the voice coils and parallel the subs. On each sub, jumper Black to Red/White Dot, then run both red's (positive) and both black/white dot's (negative) to your amp terminals.

The diagram is here.

Hope this helps.



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Cut out


rewire the subs-each sub you want in series=8 ohms per sub-then at the amp wire the two 8 ohm subs in parallel which brings the ohms back down to 4 ohms which is optimal for the amp and it shouldnt shut down on you any more-try that-good luck

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I did what you suggested..


Take it to a car audio shop that has test bench and ask them to check it for you.

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If the subs are dual 4 ohm voice coils, you could hook the DVC's of each sub in parallel ("+"'s together, "-"'s together) making each sub essentially 2 ohms. Then connect one sub to each channel of the amps. This will put about 200W on each sub.

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