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Hum from computer audio connection

Discussion in 'Hardware' started by knightmelodic, Nov 2, 2007.

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  1. knightmelodic

    knightmelodic Thread Starter

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    Running XP. Hand built comp. 15' run to my stereo with a mini jack wire, the f/mini to rca. Gettin a big hum from my speakers any time I try to play audio from my computer.
    Now I have tried 3 different recievers/amps with the same results. My new TV has a mini imput for computer connection. Same result. I'm thinking the run is too long.
    But! If I can get a video card with an hdmi connection, wouldn't that include the digital sound? And since it's digital, the length of the run shouldn't matter, right? Or do I have this all screwed up? Any help would be appreciated.
    Oh, btw, the computers speakers don't hum at all.
    Thanx.
     
  2. cwwozniak

    cwwozniak Trusted Advisor Spam Fighter

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  3. ryde01

    ryde01

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    listen to the man above and plus a number of things you need to do
    1. make sure the cables or leads your using are good quality oxygen free copper wiring
    2. go to start on xp, all programs, then accessories, entertainment, then volume control, properties, recording and then turn the mic volume down or off.
    3. propertys , playback, line in turn down half way
    that should sort your problem out safe.
     
  4. knightmelodic

    knightmelodic Thread Starter

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    Thank you guys. That radio shack iso loop is least expensive, so I'll start there.
    The HDMI is audio and video uncompressed digital signal, so a video/sound card supporting the format would be my next step. I've just no idea where to find one.
     
  5. cwwozniak

    cwwozniak Trusted Advisor Spam Fighter

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    My mistake. :eek: For some reason I had thought I had set up a computer earlier this year with analog audio through the HDMI connector. Forgot that the owner went with running analog audio out of the computer's built-in sound controller and used the HDMI connector (on an MSI NX7600GT Diamond Plus controller card) for just the video.
     
  6. knightmelodic

    knightmelodic Thread Starter

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    No prob. A lot of video cards have the DVI connection which can easily be adapted to HDMI; it's still only video though. What I find interesting is that you found a card with HDMI connections. How did, or would the audio interface? Or maybe there is a second audio card and some kind of connection to the vid card?
     
  7. cwwozniak

    cwwozniak Trusted Advisor Spam Fighter

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    That particular video card had an internal header for an S/PDIF input. That particular Dell PC did not have an external or internal S/PDIF output. The only S/PDIF output was on a header in the back of the DVD drive. The computer was going to be in the guy's entertainment center and he said he try running with the 5.1 analog outputs that were built-in. There were no complaints and he never did ask me to find an an audio card with S/PDIF outputs.
     
  8. knightmelodic

    knightmelodic Thread Starter

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    Hmm. Interesting. Basically a TOSLINK connection. Which is compressed digital, but he went with the 5.1 analog. Well, different strokes... I just know the HDMI is not suseptable to ground loops. After taking the advice given here, the hum seems to be gone. Keep your fingers crossed...and thanks.
     
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