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Thread: Pops at start and end of audio streams

  1. #1
    MrZ
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    Pops at start and end of audio streams

    I'm using an Intel mobo sending audio by USB to an X-tronic USB DAC AMP that sends it itself to the car audio system.

    The problem I have is that every time a sound is loaded there's a pop at start and another one when it ends. It's not a super loud pop, but it's perfectly audible.
    There are no other sounds, hisses or cracks, just "pops" at start and end of audio streams, no matter if it's Centrafuse, Winamp or anything else streaming audio.

    Any ideas about what are causing them? Thanks.

  2. #2
    Variable Bitrate
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  3. #3
    MrZ
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    Thanks for your response, but that's NOT my problem.

    I'm not talking about pops at AMP START but pops at STREAM START. My system sends a pop EVERYTIME A SONG STARTS AND ENDS.

    For example in Centrafuse, it will pop everytime I press a button (button press sound), everytime I load a song, everytime the song ends and so on.

  4. #4
    MySQL Error soundman98's Avatar
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    it could be a issue with the factory amp turning on and off when it doesn't see a high enough signal, it could also be a faulty audio card, or your system is running out of resources. i have a hunch that it is a computer issue.


    these are all guesses, though, so yuo will need to do some more troubleshooting-- so far i do not know of any one piece that would cause this (but i still have alot to learn)

  5. #5
    MrZ
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    Well, I've concluded that it's a problem with the USB DAC Amp. Car's amp is working nicely and doesn't pop at start, even when it's connected to 12v acc.

    I've tried all other USB ports for it and it happens all the time. The only way to minimize it has been to enable the crossfade, so there are no silence spots between songs. Anyway if I press pause, play, pause, play I can get a pop each click.

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    MySQL Error soundman98's Avatar
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    i just had a thought(or brain fart) have you tried newer/updated/different drivers yet? it is really startignto sound like a software issue, so you might want to try that first..

  7. #7
    MrZ
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    USB DACs are detected by the system as USB Audio Codec and use Windows native support. I don't know if there are any drivers available...

  8. #8
    Maximum Bitrate
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    I've learned that DACs that receives the signal and is powered by USB may be more prone to noise. I've since went Spdif out through Optical and allowed an external device to be the DAC.
    This is the one you have correct? If so, It says that the output voltages can be adjusted. By chance, have you tried to increase the output voltages of the DAC, and in turn decreasing the amps gain settings to compensate. It is possible that you may just be amplifying the noise that is present. And when you increase the audio level the noise floor should stay at the same level, but when you decrease the amps gain to get the output to about the same level you won't be amplifying the noise floor as much.
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  9. #9
    MrZ
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    Well, maybe voltages can be adjusted, but there's no external way to do so.

    Also it's not "noise" but very defined clicks or pops at the start and end of the streams.

    I'm going to try an ASIO driver through Virtual Audio Cable and see if it's a driver problem.

  10. #10
    MrZ
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    Well, it's definitely a driver issue. I've installed Virtual Audio Cable, ASIO4all and VSTHost, so now I send the audio stream to VAC, then VSTHost and then out by the ASIO driver.

    No more clicks, although I've lost some gain, which I solved in VSTHost with a 31-band EQ.

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