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Thread: m4-atx Thump Delay?

  1. #1
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    m4-atx Thump Delay?

    I have a factory bose system in my truck hooked up to a wiring harness that has a blue/white amp turn on wire. I have connected this to the inner pin of the J6 connector on my M4-ATX. This does it's job sending a signal to the wiring harness and in turn to the amp to turn the bose amp on.

    My problem is I get bad audio feedback until the PC boots to the windows log in screen. Once there the noise is gone and everything sounds crystal clear.

    One solution I am working on is setting up the PC to "instant on". However it would be great if I could keep the amp from coming on until I am at the windows log in.
    Is there a way to modify (increase) the length of delay for the thump pin header turning on the amp? Or did I fail at some point in my setup? I do not have the ground pin (on the J6) hooked up to anything currently.

    Reference pics::
    J6 header

    Amp turn on wire
    Last edited by mrwesth; 04-19-2012 at 06:40 PM. Reason: Provide additional information, clarification, and reference pics

  2. #2
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    Well, that pin output on the M4ATX near the molex connectors has a amplifier thump pin, I imagine that is to use with an amp? Guessing it just works as a turn on wire? I'm not sure if that's what you're talking about in your post though?

  3. #3
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    Quote Originally Posted by Hdale85 View Post
    Well, that pin output on the M4ATX near the molex connectors has a amplifier thump pin, I imagine that is to use with an amp? Guessing it just works as a turn on wire? I'm not sure if that's what you're talking about in your post though?
    There are 2 different "thump" pins on the PSU, I am currently using the J6 header. The pin turns the amp on and there is no audible "pop" which I think is the point, however there is significant noise until windows first boots.

    So, I was trying to see if the M4-ATX had a way to set a delay timer before the amp turns on. If not has anyone else encountered this problem and what could I do to fix it?

    Interestingly, if I restart the computer the noise isn't there.

  4. #4
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    Still no solution to this.
    I did get a PCI audio card and it has greatly reduced the feedback. However, it is disheartening mini-box has not responded to my email yet. I have yet to hook up the J8 usb to the main board and try the software, but I'll give that a go after while if I don't hear anything else before then.

    For now the audio card does a good enough job.

  5. #5
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    Directed 528T Timer

    I would suggest using a 528T timer from Directed if all you need is a delay & the PS won't do it. I am using one to delay my glow plugs when remote starting. It has worked perfect for years.

    You can get up to a 60 sec delay off this device. Install diagram attached.
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    My 2007 Ford F350 Work Log located HERE

  6. #6
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    Quote Originally Posted by PhilG View Post
    I would suggest using a 528T timer from Directed if all you need is a delay & the PS won't do it. I am using one to delay my glow plugs when remote starting. It has worked perfect for years.

    You can get up to a 60 sec delay off this device. Install diagram attached.
    Awesome info.
    The new audio card has actually eliminated the problem; There is still noise in the line, but it is very low and no different when in windows or not.

    I will definitely look into this though--I'm an information junky and who knows when I might need it. Thanks!

  7. #7
    Maximum Bitrate Mickz's Avatar
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    Quote Originally Posted by mrwesth View Post
    Is there a way to modify (increase) the length of delay for the thump pin header turning on the amp?
    FIY You can change the timeout with the M4 configuration application. I don’t use the timeout as my Audio mute is HW controlled by my FE. I can’t say what the max allowable limit for the M4 is but I think the default is around 3000ms.
    GA-Z77N-WIFI, i5-2400S, 8GB, Intel 520 128GB SSD, M4-ATX Modified, 2 Rev Cams, 2 Web Cams
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    T-Screen HVAC control, custom microcontrollers, code and FE. CarPC Project

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