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Thread: Nasty, Nasty PC Audio

  1. #21
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    Coupla ground things I've been dealing with on parallel project you might consider as well... Dunno if it'll help, but it won't hurt.

    Clean and tighten the engine ground strap. Also the primary ground from the battery to the frame. Try adding a ground strap from your equipment to the engine as well. If nothing else you may improve how the car runs...

  2. #22
    JAC
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    Quote Originally Posted by akwash79 View Post
    Where to begin?

    I have a M10000 powered by the m1-atx psu. Both amp and pc are wired directly to the battery using 10awg wire and both grounded to the same spot under a bolt in the trunk(I DID sand this down to bare metal). The audio is going out directly to the 4-channel amplifier(no HU).

    1st attempt - I used the onboard sound and got alternator whine and buzzing sound whenever the HD was being accessed or duriing mouse movements(on touchsscreen). When removing the RCA wires from the amp, the noise stopped.

    2nd attempt - I used the Turtle Beach Roadie USB sound card for audio out. While this improved the sound quality greatly, the same alternator whine still persists. But...... get this......I no longer hear a buzz when the hd is being accessed or during mouse movements, the buzz is now constant and ONLY goes away when the hd is being accessed or the mouse is moved. WEIRD. I hooked up a pair of headphones to the audio out from the roadie and I did not hear any noticeable noise.

    Also, my rca cables are no where near the power or ground wires.

    My next steps:

    1. Try hooking a cd player or ipod directly to the amps to see if the noise is still there(may be difficult to come across one of these without purchasing) I may try using my pocket pc, just need an adapter.

    2. Ground loop isolaters - although this really doesn't SOLVE the problem just masks it.

    3. Ground amp and pc under 2 different bolts?

    4. Better RCA cables(although I really doubt that this is the problem)

    Any other suggestions before I lose my mind?
    99 Mercury Cougar



    akwash79, it sounds like you covered all the bases. Try moving the mini plug from your RCA cables where it connects to the pc (grabbing the plug while inserted to computer and moving it clockwise/counterclockwise or even pulling/pushing it in/out while playing music- listen carefully to see if it's this contact that's creating the buzzing/whine). I had a similar experience with my mobo and tried everything even spent loads of money to fix it when all the while it was the audio connector from VIA that was inferior from the factory, Anyway I fixed it. Please keep us informed..curios to see if this helps.

  3. #23
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    I went to ratshack and got the GLI cables they had and connected them in my car. I started my car expecting them not to work......heard absolutely NOTHING!
    Then frodo began to load and I was then expecting a severe loss in audio quality but it didn't seem to affect it much if at all. Needless to say I am now very happy with this outcome.

    Thanks for all your help and suggestions. Right now I have a Jensen 35w x 4 RMS amp. Do you know what type of amp I would need to eliminate this?
    [HL]Warning - NSFW [/HL]

  4. #24
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    so the problem was crappy cables.

    That amp isn't helping either.

    Jensen is the bottom of the barrel when it comes to car audio.

    In case you haven't noticed. You get what you pay for in this world.
    Jan Bennett
    FS: VW MKIV Bezel for 8" Lilliput - 95% Finished

    Please post on the forums! Chances are, someone else has or will have the same questions as you!

  5. #25
    FLAC greatwhite's Avatar
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    Well, she said!

    Cheers

  6. #26
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    Quote Originally Posted by RedGTiVR6 View Post
    so the problem was crappy cables.

    That amp isn't helping either.

    Jensen is the bottom of the barrel when it comes to car audio.

    In case you haven't noticed. You get what you pay for in this world.

    The strange thing is that the RCA cables on the GLI themselves appear to be a lower quality build than the previous RCAs I was using(the cables on the GLI are much thinner than my others).
    [HL]Warning - NSFW [/HL]

  7. #27
    What can I say? I like serial. Curiosity's Avatar
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    You should rip open the old cables and check to see what they look like, or just use them in your home. The cheaper cables usually have an open braid which allows higher frequencies through. The better stuff is solid braid, and better has foil wrap over that.

  8. #28
    FLAC greatwhite's Avatar
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    Glad you solved it!

    Cheers

    BJ

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