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Thread: Another M4 ATX Anti-Thump problem

  1. #1
    Maximum Bitrate david69leonard's Avatar
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    Another M4 ATX Anti-Thump problem

    I purchased my M4 a few years back, I have never used it to remote my amps. I have always had a HU to do this for me. A few weeks ago I did away with the HU now im running two amps, one for sub one for components. Ive had everything connected correctly, USB/anti-thump ect.

    Now i have a loud thump just as soon as the windows logo disappears during start up and the same after shutdown. The amps dont turn off for another 30 sec or so after shutdown. I have the minibox software installed, i have changed the parameters of the anti-thump several different ways 30000ms, 15000ms, 0ms, ect. No change. I feel like im whipping the crap out of a

    I have read page after page of every thread regarding this and no solution has been presented that i have found... My eyes feel like they are going to explode from reading so much.

    Is there anyone who has had this problem in the past and fixed it? Please guide me in the right direction

    Thanks Dave

  2. #2
    MySQL Error soundman98's Avatar
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    do your amps soft-start, or is it definitely a carpc sound? another thing you could try is a program called ampctrl(or something like that-- uses a serial port to turn on the amps once the OS is loaded)

  3. #3
    Maximum Bitrate david69leonard's Avatar
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    The Eclipse amp I am running for my components doesnt thump, However the SPL amp I am running for my sub does and it damn near blows the hatch off. Ive looked into ampctrl, but i would prefer to just use the M4 if at all possible

  4. #4
    MySQL Error soundman98's Avatar
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    so if you unplug the amps from the pc, they do not thump at all when they turn on?(cheap amps thump by themselves, and i am trying to rule this out... i don't believe this is the case, being that i assume you didn't have the problem when running a hu..)


    you can also use a pulse timer like this. though the problem with this method is that if the pc is delayed while booting, you still get the pop..

  5. #5
    Maximum Bitrate david69leonard's Avatar
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    I dont get a thump with the audio unplugged from the amp, I think Im having the problem when windows starts my onboard sound. The only way i think i can avoid this is by setting the M4 to turn on the amps 30 sec after ignition and to turn them off immediately after turning ignition off. However the software that minibox has only provides a single parameter field for anti-thump.

  6. #6
    Maximum Bitrate david69leonard's Avatar
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    I managed to get rid of the start up thump, after unplugging the power from the M4 after setting the thump timing to 20000ms, plugging it back in, the settings took, however it still thumps during shutdown, the amp doesnt shut down untill the system is completely off after about 30 seconds.... IDK

  7. #7
    MySQL Error soundman98's Avatar
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    what about adding a relay using the acc line to turn the amps off right away?

    (use acc and ground on pins 85 & 86, antithump on m4 goes to 30, and amps go to 87)

  8. #8
    Maximum Bitrate david69leonard's Avatar
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    Quote Originally Posted by soundman98 View Post
    what about adding a relay using the acc line to turn the amps off right away?

    (use acc and ground on pins 85 & 86, antithump on m4 goes to 30, and amps go to 87)
    That is an awesome idea, i will try and let you know how it goes

  9. #9
    Maximum Bitrate david69leonard's Avatar
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    I added the relay, it does the job. However I cant help but think of this as a Band-Aid, it fixes what the M4 should already do. I love the PSU, but it doesnt work as advertised when the anti-thump feature is a question. Thanks soundman for the fix!!!

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