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Thread: Pioneer gmx 404 - Strange problem

  1. #1
    Junior Member
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    Nov 2009
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    New Zealand
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    Pioneer gmx 404 - Strange problem

    Hey, I was installing this pioneer amp yesterday and had an unusual problem with it.

    Wired it all up then plugged in my mp3 player using RCA to 3.5.

    I could get no sound if Left and Right RCA were in the input

    However, If I had one of the two RCA's plugged in and I touched the other to the Chassis of the amp I would get a signal to one of the speakers.

    Worked for Left and Right.

    Anybody had a similar issue?

    Layout of amp

  2. #2
    Senior Member
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    Aug 2009
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    Los Angeles, CA
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    Re: Pioneer gmx 404 - Strange problem

    Quote Originally Posted by RichardWilson
    Hey, I was installing this pioneer amp yesterday and had an unusual problem with it.

    Wired it all up then plugged in my mp3 player using RCA to 3.5.

    I could get no sound if Left and Right RCA were in the input

    However, If I had one of the two RCA's plugged in and I touched the other to the Chassis of the amp I would get a signal to one of the speakers.

    Worked for Left and Right.

    Anybody had a similar issue?

    Layout of amp


    the thing with car amps is that they require a bit more volume then just an mp3 player can put out thats why it goes like this ... 1-mp3 - 2 stereo aux input(amplifies mp3) - 3 amp... so direct mp3 player to amp with 3.5 to male rca's its a bit of a toss up on the amp if it will pick it up... also u have to have the main gain all the way up... forgot also make sure u dont have the amps built in crossover on (nor on lpf or hpf )

  3. #3
    Junior Member
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    Nov 2009
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    New Zealand
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    Turns out I just had to run a wire from the ring of one RCA to the ground on the amp.

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