I have a Soundblaster Audigy Gamer. I initially had a pair of headphones (cheap Philips HP170 headphones) plugged into the line out jack. Set up like this I got strange audio artifacts. Notably - I would get a soft, high pitched buzz/squeal when I used my mouse wheel. The noise synced perfectly with my usage of the wheel. The mouse is a USB Logitech MX500. Other artifacts occurred, but this was the most annoying. Disconnecting the CD_In cable as well as the CD_SPDIF cable eliminated these artifacts.
Any explanations as to what was going on?
<b>1.4 Ghz AMD T-Bird underclocked to 1 Ghz...just to be safe!</b>
Keep the cable away from the monitor cable and mouse cables. Shifts in the screen change the magnetic field around the monitor cable, which changes the signal going through your headphones.
As a side note, your headphones act like an antenna to any EM interference around your computer. That's why walkmen use the headphone cable as an antenna when listening to the radio - magnetic fields induce a current in a wire - longer the wire and closer to the source of the field and the stronger the field, the higher the induced current. Sorry to say it, but you're kinda SOL in the end.
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