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Thread: Sound Cutting out when increasing volume and accelerating

  1. #1
    Newbie
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    Apr 2005
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    Sound Cutting out when increasing volume and accelerating

    Maybe someone can help us, we seem to be exeriencing a problem when we pump up the volume on our carpc.

    Here's a rough spec of the machine:

    P4 1.8Ghz Machine
    Opus 150Watt DC Power Supply
    256Mb RAM
    7" Screen
    2 Channel Amp power stock speakers and 2 6x9's, as well as a sub
    Running MediaCar software


    The carpc works fine normally, movies, mp3's etc all play fine without any problems.

    When we turn up the volume to hear the music whilst the windows are open or because there's a good song on, you'll hear about 2 seconds of music and then nothing. The computer is still performing well yet there is no sound.

    Restarting the car (and therefore the computer and amp) gives you sound again, but we have to make sure that we've turned the sound down before restarting or we'll get 2 seconds of music again and then nothing as before.

    Thanks for your help with this.

  2. #2
    Newbie
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    May 2005
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    Ottawa, Canada
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    I've had a similar problem like this in the past. The problem seems to be that some active device in your audio chain, most likely your amp or Head Unit (if you're using one), is going into thermal/electrical protection mode.

    The first thing I would check is whether your amp is overheating, the the HU. In my case, the problem was a defective head unit that went into protection mode for nothing, and I have a seen a Kenwood sub amp overheat in minuted because of a defect and also shut down.

    So it's rather unfortunate for you, but I'd say chances are either your amp or HU will need to be repaired or replaced.

    RFMan

  3. #3
    Variable Bitrate SickVette's Avatar
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    May 2005
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    Wesley Chapel, Fl
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    It could be that the impedance is too low on the amp and or the power wire/ground wire is too small. How many speakers are you powering, what impedance are they, and what is power cable size? It is possible that a piece of equipment is bad but it is better to diagnose everything first.

  4. #4
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    May 2005
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    Ottawa, Canada
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    Good point. I never think of installation issues because I've been doing stuff like this for so long that it's almost a no-brainer to me. But make sure that the load on your amp is within the allowed range and that your power wire is sufficient (I'd say at least 8AWG or bigger)
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  5. #5
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    Apr 2005
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    Cheers, for your help guys, I'm looking into cabling and checking the load on the amp... it could just be that my amp is pants.

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