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Thread: Noob Q - Power-on thump

  1. #1
    Low Bitrate romanman69's Avatar
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    Noob Q - Power-on thump

    hey im sure many have asked this question before but i couldnt find it since i have no ideqa what to search for

    but anyways here goes:

    when i power on my carPC my sub and speakers thump.

    also as windows goes through POST it gives that 1 really loud beep.



    is there anyway to get rid of these two annoyances

  2. #2
    Car Audio Moderator durwood's Avatar
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    the best way to search is go to google and type "turn on pop or thump" and then follow that by www.mp3car.com

    but here you go...

    Turn-on amp POP Stoppers

  3. #3
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    how are you powering your PC?

    if you are using a dc-dc PSU, most of them have built in turn on thump protection.
    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!

  4. #4
    Maximum Bitrate GoHybrid's Avatar
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    if you're familiar with 555 timer circuits you can build your own delay for turning on the amp. Certainly not as elegant as some solutions but a fun little project to do nevertheless.
    Et ipsa scientia potestas est.

    Worklog for my 2007 Civic Si ...f*** it...
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  5. #5
    Constant Bitrate dan__wright's Avatar
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    theres a service in windows (within the registry) call beep, you need to disable that (set it to 4) and it will stop the beep in windows.

    as for the pop, the amp is on before the pc is, when the pc comes on the output on the soundcard becoming live makes the pop, you need to make sure te amp comes on after the pc
    Audio: Alpine PXA-H700 DSP, Rockford Fosgate Punch P4004 amp, P152S Comps and Alpine SWR-1242D Sub
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  6. #6
    Maximum Bitrate GoHybrid's Avatar
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    hey... just to clarify... POST is Power On Self Test... which is usually a function of the BIOS, so... checking for keyboard, memory count, bios revision, that sort of thing happens BEFORE windows begins to load.... is that the beep you're talking about or is there a different beep that is actually happening after the windows logo appears?
    Et ipsa scientia potestas est.

    Worklog for my 2007 Civic Si ...f*** it...
    Pictures of the Corolla (retired)here
    Need to make something? Here are a few ideas.

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