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Thread: Thump noise on epia bootup

  1. #1
    Maximum Bitrate
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    Thump noise on epia bootup

    Hi There

    When i turn on my pc in the car (epia800) it sends out two distinct noises one short bump/thump kinda noise and one right after, sorta crackling. i have no generator noise when the system is running, so i am kinda lost for solutions. Can i put something on the audio out from the epia to stop these noises ?

    Also if i want to use the spdif digital out what would be a cheap/medium priced starter amp to use ?

    Jan

  2. #2
    FLAC
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    Dope,

    Most CarPC's will send out a "thump" when they're powered on, if the audio amp is already powered up. The best way to avoid the thump is to delay turning on your auidio amp until after your CarPC is powered up.
    MikeH

  3. #3
    Constant Bitrate b_nom's Avatar
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    Yeah, my epia does that too
    '96 Chevy Cavalier - EPIA M10000, Win2K,MediaCar, Deluo GPS Mouse with Routis, 60GB external HD, 7" widescreen monitor from DigitalWW.

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  4. #4
    Maximum Bitrate
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    Doh, what if i was to attach a usb or another pci sound card, would it do the same ?

    Jan

  5. #5
    Maximum Bitrate more mods's Avatar
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    I use Creative USB on my EPIA 800.
    It thumps and cracks too.

  6. #6
    FLAC
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    I would guess the USB may work better if the USB hub stays powered when your CarPC is turned off/on. As for the PCI card, sicne it gets power from the CarPC, it will probably thump too.

    The only good way to get rid of the thump is to add a few seconds of delay to the RemoteOn signal that feeds your audio amp or head unit.... This way, the sound card's output has settled out before your amp amplifies it.
    MikeH

  7. #7
    Variable Bitrate no1knows's Avatar
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    Just stick a relay, triggered by your power supplies 12v, in between the sound out and amp. Just splice the RCA cable and cut the positive as the switched.
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  8. #8
    Variable Bitrate
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    I solved that problem with a relay from davidnavone.com. It turns my amp on a few seconds after the Epia comes out of sleep.

  9. #9
    Maximum Bitrate more mods's Avatar
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    Quote Originally Posted by MikeH
    I would guess the USB may work better if the USB hub stays powered when your CarPC is turned off/on. As for the PCI card, sicne it gets power from the CarPC, it will probably thump too.

    The only good way to get rid of the thump is to add a few seconds of delay to the RemoteOn signal that feeds your audio amp or head unit.... This way, the sound card's output has settled out before your amp amplifies it.
    My USB is powered all the time, and it thumps and cracks.
    The relay would proably work thou.

  10. #10
    Maximum Bitrate more mods's Avatar
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    Quote Originally Posted by Alric
    I solved that problem with a relay from davidnavone.com. It turns my amp on a few seconds after the Epia comes out of sleep.
    What model # did you get?

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