Question about Pioneer DEH-P6900UB CD Player

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Speaker hookup i bought a pair of 6x9 pioneer and i installed it on my deh6900ub. i follow the instructions to use 2 speakers and everything good.. bit i notice a problem, when i hook up both speakers to the white and gray wires as it said to do the sound quality drops ..when i disconect one speaker it plays loud and clean but when the 2 are on the sound drops with little or no quality to it. what is that problem ? can anyone help me cause im ready to send it back .

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Re: speaker hookup

Sounds like 1 of your speakers is fed backwards. this does happen quite often. try reversing the chords from the second speaker. (put grey in white and white in grey) if this doesn't work then theres a short and it should be taken back.

Posted on Dec 07, 2007

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I need the wiring diagram for the Pioneer CD player model DEH P6400

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Car amplifier has been removed, it was obviously in the trunk hooked up to nine speakers, etc. I just bought the car and there is a pioneer cd player and a seperate cd/dvd player under the passenger side...

I will assume that none of those wires are marked, thus leaving you with the cumbersome task of tracing each wire to its place of origin and properly marking them.

I will also assume that you have a standard hardware configuration whereas the in-dash head unit serves as an input selector and pre-amp for your aux.CD/DVD unit.

A possible shortcut would be to first identify the two power leads( one is a constant 12+ volts & one is a switched 12+ volts that is a remote power lead from the head unit) and the ground that was ran to the missing amp, mark and separate those from the group. Then with a test speaker trial and error those remaining signal (speaker) wires with the in-dash CD player on and loaded so as to find that units signal outputs (there may be more then one pair) You will need to identify left and right output signal pairs by adjusting the head units L & R control and marking those wires accordingly. Next with a pair of signal leads with output, temporarily connect them to all of the other unidentified signal pairs as to determine its speaker and marking them accordingly. At this point you should be able to make your left and right speaker connections.

Note: it will be wise to have a DC voltage tester to check for the missing amp power leads and signal polarity especially if you plan to install a new amp.

I hope this sheds a little light on your problem.

Good luck

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Use a hole saw to cut a 2 to 3 inch diameter hole in the side of the speaker box for a port to get a better punch from the sub.
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