Question about Rockford Fosgate Punch 401S Car Audio Amplifier

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Only one sub hitting

I have every thing wired right but I can unplug my left sub while their hitting and i cant tell a difference in sound, its like its not even hitting, my right sub is hitting hard though any suggestions?

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  • blueextc3221
    blueextc3221 May 11, 2010

    Check the voicecoils with an ohmmeter (DMM set to 20 Ohm setting) to verify each coil is at the proper impedence.

    Remove as you put them back in the enclosure after testing - try it by attaching to amplifier.

    If you haev 0 on the DMM, your voicecoil is blown - and not repairable.



    Also be sure they are wired in phase - working together. After they are back in the box - before finalizing the wiring - use a cordless drill battery to "pop" the speakers and verify they are both going in the same direction... OUT when + is on + of battery and - is on - of battery.

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  • 13 Answers

You most likely have them wired out of phase. Try reversing the wiring on only one of the speakers.

Posted on Apr 23, 2009

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