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interference / feedback through pc speakers

[Deleted User][Deleted User] Posts: 2,301
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in PC & Mac Hardware and Software #1
I have tower pc I bought earlier this year. I had it wired to my broadband, but after moving recently I am now using a wireless USB. I am getting a buzzing through my speakers now that I can't seem to fix. I suspect it could be the stick itself causing this? I can use the speakers but have to keep them very quiet otherwise the noise is irritating. It's constant when the computer is on. Any ideas how to fix this?

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    KleistKleist Posts: 141
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    #2
    http://www.siber-sonic.com/electronics/GLoopwhatis.html

    Perhaps a ground loop. Others may know more,I'm not an audio specialist.
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    Andrew_BallardAndrew_Ballard Posts: 1,054
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    #3
    Are the speakers connected via USB? Does the buzzing cease when the wireless USB is removed? Try changing about the USB ports you are using. If connected to the analogue outs a connection may be lose/damaged which can cause weird noises so make sure connection is firm and give it slight wiggle/reinsertion to see if the noise ceases. Can't think of anything else atm, try using the speakers where they are with a portable device and see if they still hum.
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    chrisjrchrisjr Posts: 33,282
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    #4
    There is one very easy test to make. Simply remove the USB stick and power up the PC and speakers. If there is no noise and music plays cleanly then perhaps it is the USB stick.

    So plug the stick back in and see if the noise returns. It is quite possible the USB stick is radiating RF interference into the speakers. Though any half way decent set should not be bothered by this.

    One thing that you could try is to use a short (no more than 1m) USB extension lead. Use that to extend the USB stick away from the PC.
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    [Deleted User][Deleted User] Posts: 2,301
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    #5
    Thanks to everyone who replied. I tried all of the above without much luck. Today I detached and re-attached the speakers and the problem is gone. Feeling like a bit of a jerk! :o All comments were appreciated!!
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    s2ks2k Posts: 7,421
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    #6
    Handers wrote: »
    Thanks to everyone who replied. I tried all of the above without much luck. Today I detached and re-attached the speakers and the problem is gone. Feeling like a bit of a jerk! :o All comments were appreciated!!
    Reminds me of the time I went to look at a PC with a similar problem.... In this case the user's PC was connected to an external hifi amplifier that powered the speakers. Naturally cos it wasnt working she had turned it up full blast to try and get it to work (it was on the wrong inputs etc anyway). The amp itself was sat on top of an old VCR and all the speaker and PC wires were in a massive birds nest behind the back of the PC, VCR, printer etc. Now I admit I was crap at Science when I was in school but somehow the nest of wires, combined with the RF tuner of the VCR (im guessing) and the massive gain from the amp had turned the whole thing into some kind of makeshift AM radio.

    Shortly after untangling the wires and turning the amp down to a normal level everything was fine.:D
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