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Thread: Wining sound only when car in motion

  1. #11
    MySQL Error soundman98's Avatar
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    there could be a issue where one ground has better conductivity than the other one, but as long as you have them grounded close, you might as well try to connect them to the same grounding point.

    so far, i have not heard of any noise issues with the m4, so far, mostly just power issues, and usb connectivity not working.

  2. #12
    Constant Bitrate sergatiuk's Avatar
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    theoretically it would be enough for all the devices to have their own ground, practicly it doesnt work too well... in different cars its different case, however throughout the chassis there are many frequencies produced by different devices and therefore different parts of the chassis might have different frequencies.
    my recommendation for the next step would be to try to ground the PC and AMP on the same bolt. also run a ground wire between your PC case and chassis.

  3. #13
    Newbie migitcheetah's Avatar
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    i will try grounding them the same. but i dont have a case for the pc. its built from fiberglass. and its open on top. wound that be an issue
    My name is Ryan and im a CarPC....

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  4. #14
    MySQL Error soundman98's Avatar
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    you could try grounding one of the motherboard screws to make sure that the computer is properly grounded.

  5. #15
    Newbie migitcheetah's Avatar
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    would that work as if i grounded the case.
    My name is Ryan and im a CarPC....

    Check out my post 94 Cadillac Seville

    If your in Oregon hit me up. lets get a meet going. or let me know of any.

  6. #16
    Constant Bitrate sergatiuk's Avatar
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    more or less... if u had the metal case. but do try to ground one of the bolts to the chassis... and if that still doesnt work then split the -12V wire on the PSU output, by adding another wire and run one to the mobo and one to the chassis, that should dfo the trick.

  7. #17
    Newbie migitcheetah's Avatar
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    ok i will try those both and see what happens. thanks for everything. and i will let you know if and how i got it fixed.
    My name is Ryan and im a CarPC....

    Check out my post 94 Cadillac Seville

    If your in Oregon hit me up. lets get a meet going. or let me know of any.

  8. #18
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by sergatiuk View Post
    their own ground is not good... every device on your setup must have the same ground source, either bat or chassis
    try this....
    ground the amp, PC to chassis, at the same point. ground the PC case to chassis as well.
    if stiff doesnt work, take the wire harness from the PSU to the Mobo and add another wire to the ground and attach it to the chassis as well.
    OMG..... are you kidding me!!!!!!!!!!! I have had EMI for god know how long. I am not sure if I will have it once the new equipment is in though. My setup is seperated, the PC is in the middle but is grounded under the passenger seat with all the other electronics. The AMPS, two M4-ATX, and 6 computers will be grounded in the back..... Do you think this is what is causing that?
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  9. #19
    Newbie migitcheetah's Avatar
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    well it is posible. i used to have all my amps grounded diferent, but when i fixed that. grounded to the chasis in the trunk, it fixed them. the pc i still cant figure out. i grounded a MB screw but it did nothing, so i still have the GL isolators in place. but what i thnk did the trick for my amps, is getting new wires, and running them nice an streight. no crossings and no twist. to the ground and the amps. and bateries. so maybe try to rewire everything. keeping the wires streight withought crossing ver eaccover thing. that might help.
    My name is Ryan and im a CarPC....

    Check out my post 94 Cadillac Seville

    If your in Oregon hit me up. lets get a meet going. or let me know of any.

  10. #20
    Constant Bitrate sergatiuk's Avatar
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    Quote Originally Posted by HiJackZX1 View Post
    OMG..... are you kidding me!!!!!!!!!!! I have had EMI for god know how long. I am not sure if I will have it once the new equipment is in though. My setup is seperated, the PC is in the middle but is grounded under the passenger seat with all the other electronics. The AMPS, two M4-ATX, and 6 computers will be grounded in the back..... Do you think this is what is causing that?
    if we had a streight answer to whats causing it, i dont think this questions would pop on a daily basis.. but the reason that we dont have it is because every setup is different, every vehicle is different with different frequencies and devices. and many people find different solutions working for them. USUALLY its caused by different ground frequencies between the AMPs and PCs, improper isolation, cockroaches under the carpet, tornadoes, tsunamis, aliens ....
    but trying different tips and configurations might just solve this problem...

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