Question about Pioneer DEH-P7400 CD Player

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The bass box

I have wired up my amp and bass box to the head unit, but when i turn it on all my bass box keeps doing is thumping even if there is no music playin. everything to my knowlage is wired up correctly but i can't see why it is doing that. my bass box is bridged, but i can't see how that would have anything to do with that. hope you can help many thanks

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Hi Jamesroy,

Remove the Audio inputs from the bass box to see if the thump is coming from the Audio input. Of course do this with everything turned on. What we are trying to figure out is where the thump is originating from. If the bass box does not thump when the audio inputs are disconnected, the thump is coming from somehwere between the bass box and the circuits inside the head unit.
If you still have the thump after the Audio input wires are disconnected, then your bass box's amplifier has noise problem. You might try getting a noise filter from best buy to put on the power supply feeding the bass box.

Posted on Nov 30, 2007

  • Greg Stokes
    Greg Stokes Nov 30, 2007

    Oh yeah, I you determine the thump is not in the bass box, also get a Noise filter from Best buy for the Red Wire feeding power into your head unit.

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Had a similar problem, mine was a power problem.
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