Question about Kenwood KAC-9102D Car Audio Amplifier

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Rockford P550.2 going into protect mode

I have a Rockford Fosgate P550.2 pushing a kicker CVX 12 and when it starts hitting good it will go into protect mode and then come back on after a few minutes, then shut back off.... Can anyone help?

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  • hoops2coupes Oct 09, 2007

    it's only for about 20 seconds it shuts off then comes back on, it's not really hot

    How do I figure out the amps ohm load?

  • hoops2coupes Oct 10, 2007

    it's a dvc and if they are wired like an X is that in series?

    it's the 4 ohm impedance

    amp is not bridge

  • hoops2coupes Oct 10, 2007

    nah amp is not bridge I have it on one channel

  • hoops2coupes Oct 10, 2007

    the thing is I know it's not the amp because I've hooked up 3 different amps to the sub and it's made them all go into protection, and the weirdest part is in the mornings it works fine, of course once I really get it hittin it shuts off but in the evenings it constantly shuts on and off every 30-40 seconds  could it be a bad ground?   I am stumped man


    how would I go about running each coil per channel? have two sets of speaker wires comin off of it?

  • hoops2coupes Oct 10, 2007

    well I'm almost positive it's not the amp, I've hooked up 3 different amps and they've all done this, funny thing is most mornings, I can have no problems with it, I can turn it up and it will play for a while until it goes out, but in the evenings it's going out every 30-40 seconds or maybe longer


    as far as running one coil per channel how does that work?  does that just mean I would have to sets of speaker wire coming off that one speaker?


    Man I appreciate all the help you have given me, I feel as if I'm almost near the solution.  Thanks again.





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Does it shut off for a couple of minutes or a couple of seconds? Is the amp hot when it shuts off? Are you sure you have the speakers wired to an acceptable ohm load for the amp? Have you measured the voltage at the amp (across the B+ and ground terminals) to make sure it's not dropping too low on hard bass notes?

Posted on Oct 09, 2007

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  • Anonymous Oct 09, 2007

    Is your woofer a single voice coil or dual voice coil?

    How many ohms is EACH voice coil?

    How is the speaker (assuming you have only one) connected to the amp (bridged or not)?

    If it's a DVC woofer, are the coils wired in series or parallel?

    OR... are they each connected to one channel of the amp?

  • Anonymous Oct 10, 2007

    It sounds like the speaker is wired in parallel (both positives together and both negatives together).

    If so and each coil is 4 ohms, that's a 2 ohm load. The amp shouldn't have a problem is you have the speaker connected to one channel. If you have it connected to the left positive and right negative, it's bridged and that's why the amp is shutting down.

  • Anonymous Oct 10, 2007

    Unless the other channel is defective, you should connect one coil per channel. The output would be the same but it would distribute the load instead of running one channel at its lowest possible ohm load.

    If it's not easy to run one coil per channel, move the speaker to the other channel to see if the problem remains.

  • Anonymous Oct 10, 2007

    If you run one coil per channel, you will connect individual speaker wires to each coil and then connect each coil to it's own channel.


    If this problem existed with 3 amps, it could be a voltage problem. Often a loose or corroded connection can cause a voltage drop which can cause an amp to shut down. I've also seen defective fuses cause the same problem. Glass fuses in fully enclosed fuse holders are the worst. If you have a multimeter, measure the voltage across the B+ and ground terminals of the amp when it's shutting down. If the voltage is dropping significantly, doublecheck all of the power and ground connections.


    The problem could also be the speaker. You may want to try disconnecting one coil at a time to see if one coil in the speaker is causing the problem. When one coil is disconnected, insulate the unused wires so they can't short to another terminal or to each other.


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Have you tried using bigger gauged wires? If the amp can not pull enough power through the wire it can cause it to run into protected. This solved my problem running a 2000W amp on 12 gauge wire, went to 8 and it worked great.

Posted on Nov 14, 2008


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