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Thread: "Noise "only from back connector

  1. #1
    Variable Bitrate seninha's Avatar
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    "Noise "only from back connector

    Yesterday I finally had the time to place my case there where I wanted (in the trunk)
    Last 3 weeks I was driving with the PC case on the passangers floor.
    Unitl yesterday every was running well. Sound was good without any problem.

    But now I have a really strange problem.

    I use a 4.1 PCI soundcard. The front speakers are connected to the front-out, and the back speakers to the rear-out put.
    If I connect the jack in the rearout-put I hear a very strange noise when the music is off.
    When the front jack is connected to thr front-output the sound is not here.
    Because I wanted to be shure the the problem came from the cables (maybe running to close to the power cables, I connected the front jack in to the rear out-put. Noise then came back
    If I connect the rear jack in to the front out-put noise is gone.

    So what I think is that the rear out-put conector is the problem.
    Because If it was one of the cables I would have this noise also when I connected the jack in the front-output.

    So this is the problem:

    frontjack in front out-put , no problem
    front jack in rear out-put, NOISE
    rear jack in front out-put, no problem
    rear jack in rear out-put , NOISE

    What could cause this NOISE.

    Case Is grounded through the M1-ATX powersupply. This one is connected to the ground of the car.

    Like I said, befaore I moved the case the problem wasn't there
    Gods right foot!!

    Renault Grand Espace 3.5 V6

  2. #2
    Variable Bitrate DaveB's Avatar
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    Is there an onstar box or anything else in your trunk which might give off RF?
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  3. #3
    Variable Bitrate seninha's Avatar
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    In the back there is nothing close to the PC.
    Gods right foot!!

    Renault Grand Espace 3.5 V6

  4. #4
    Variable Bitrate DaveB's Avatar
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    I don't think its the connector. The only thing that changed was you moved where the PC was located. That means, I assume, you rerouted the wires when you moved the PC. Do you get the noise both when the engine is running AND when the engine is turned off?
    8" Lilli TS
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  5. #5
    Variable Bitrate seninha's Avatar
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    Yes, Both. Doesn't matter if the engines is on or off
    Gods right foot!!

    Renault Grand Espace 3.5 V6

  6. #6
    Variable Bitrate DaveB's Avatar
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    What is the brand and model number of the sound card?
    8" Lilli TS
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  7. #7
    Tainted Love Cris's Avatar
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    I'm assuiming you kept the powerline and signal lines serate, right?

  8. #8
    cheap custom title JC-S60's Avatar
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    Could it be the ground of one of your cables is fubar'd?

    Are you sure you are using the output jack and not a line-in?

  9. #9
    Variable Bitrate DaveB's Avatar
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    Quote Originally Posted by JC-S60
    Could it be the ground of one of your cables is fubar'd?

    Are you sure you are using the output jack and not a line-in?

    I was thinking the same thing about the wrong jack. Thats why I asked what model sound card he had...
    8" Lilli TS
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  10. #10
    Variable Bitrate seninha's Avatar
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    Soundcard is a Sweex 4.1 . I use the black out-put as REAR one, and green as FRONT.

    Cables are running next to each other.
    If thats a problem why does the NOISE not come up when I connect the FRONT output only.
    Thats why I want to find out if the proble lies somewhere else
    Gods right foot!!

    Renault Grand Espace 3.5 V6

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