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Thread: Car PC sound, not as good as expected!!

  1. #21
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    the sound blaster MP3+ USB with the RCA connectors has extremely high quality output
    you may have a problem with the motherboard emitting high levels of EMI (electromagnetic interference) try to position the sound blaster USB sound card on the same plane as the motherboard, beside it (not located anywhere on top of the motherboard.
    you may want to put the sound card in a metal casing instead of the original plastic thing (4 screws on the bottom).
    you may have some problems with your computer's USB chipset.
    try the car pc at home plugged via RCA on your stereo. if you hear noise in that setup, you have a much bigger problem...
    another idea is to use some sort of capacitor across the carpc power supply
    also you want to connect the carpc and the amplifier's power supply to the same source (that is the same fuse box), so as to avoid the potential ground issues
    I don't need no stinkin' startup-shutdown controller... That's what journalized filesystems are for...
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  2. #22
    Maximum Bitrate falconey's Avatar
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    Quote Originally Posted by Glyn
    I got myself a Soundblaster MP3+ from ebay, hoping that it would solve all my problems.
    But it hasn't!!
    This is why I asked for more input on the sound you were getting like 10 post ago. I don't think it matters what kind of card you use if you're getting interference so changing the card doesn't/didn't seem like a solution. So in the original post you said it was clicking now you're saying it's buzzing. Clicking I'd need more info on, buzzing is a sure sign of bad grounds or like you were saying no grounds. As suggested ground the psu and most importantly the sound card.

  3. #23
    Maximum Bitrate brrman's Avatar
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    clicking and popping (ie. clipping) could be that the signal going into the amp is not high enough to support the gain setting you have on the amp. Try upping the signal going to the amp or lowering the gain.
    Car: 2000 Audi A4 Avant 1.8t
    Carputer 2.0: removed. Back to stock.

  4. #24
    FLAC
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    Pete...this picture is from Radio Shack, but most auto parts stores carry them in their audio section.

    Glyn,
    When the computer is idol, the noise is very quiet, move the mouse and it buzzes.
    This is exactly what my M10000 did before I added the ground loop isolator. The isolator made these noises almost inaudible.
    MikeH

  5. #25
    Maximum Bitrate falconey's Avatar
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    Quote Originally Posted by MikeH
    Pete...this picture is from Radio Shack, but most auto parts stores carry them in their audio section.

    Glyn,

    This is exactly what my M10000 did before I added the ground loop isolator. The isolator made these noises almost inaudible.
    That's good that the ground loop isolator worked, but think about it, for it to have worked you must have had a ground loop. I say screw buying these isolaters and just ground everything properly. I guess though if it works go for it.

  6. #26
    FLAC
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    Falconey,

    Before I tried the ground loop isolator, I had tried:
    1)Ground all components (carpc chassis, carpc output power, audio amp, LCD) to a single common point on the chassis with various lengths and sizes of ground wire.
    2)Taking all common points back to the battery's negative terminal.
    3)Addiing a noise filter capacitor to the audio amp.
    4)adding a noise filter cap to the carpc.
    5)playing with the volume out of the carpc and volume in of the audio amp.
    6)using the high-level inputs to the audio amp.
    7)using the low-level inputs to the audio amp.
    8)high priced RCA audio cables, low priced RCA audio cables.

    After all of the above, the ground loop isolator gave the most dramatic reduction in the "noise".

    I believe the EPIA mobo's (at least the M10000) are very susceptible to ground loops. The characteristics of this type of noise are not your normal "humm". It is "processor" noise that somehow gets into the audio chain. As Glyn characterized in his description, this noise varies as the processor load varies. As you move the mouse, change what's on the screen, etc. the noise changes. This is not what I would expect in a "normal" ground loop.

    Anyway, worked for me!
    MikeH

  7. #27
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    Quote Originally Posted by MikeH
    Pete...this picture is from Radio Shack, but most auto parts stores carry them in their audio section.

    Glyn,

    This is exactly what my M10000 did before I added the ground loop isolator. The isolator made these noises almost inaudible.
    i dont see a picture

  8. #28
    FLAC
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    Pete..I was referring to my earlier post on 4/25
    MikeH

  9. #29
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    I had my laptop hooked up to my amp and it made terrible background noise and a clicking sound.

    I swapped the laptop for a portable MP3 player (a Rio) and the clicking went away and the background noise was reduced slightly.

    Then I double-checked my grounds and it cleaned it up a lot more..

    It's all about keeping DC power away from the AC stereo signalling..

  10. #30
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    does it matter which ground loop isolator i get or are they all the same http://search.ebay.com/ws/search/Sal...perty=1&sotr=2 I do need one right?

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