I have heard strange noises coming from my speakers when i place my cell phone on my desk. If I move it farther away it doesn't happen. Just keep it in mind
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I don't have a phobile mone so it's not that... tho I do hear weird noises from my landline phone if/when it's near my tower.
You can also get feedback from a microphone, if you have one.
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Now that might've been the case a few weeks ago... snap, crackle pop coming out of my speakers while I was recording sounds for a 'gas' soundpackage.
One way I found of getting rid of it was to run DXDIAG and kept lowering the "3D Sound Acceleration" on the slider until the "snap-crackle-pop" went away.
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I've lowered 3D Sound acceleration, disabled EAX, CMSS & Sound Crystaliser, then re-enabled them at slightly lower settings, with no pops or crackles detected as yet. I also reduced the bass level on my sub-woofer, being it was more noticeable there, and all seems well so far.
However, I'm not sure this addresses the screeching sound I've heard twice now... I hope so but I'm not so sure they were/are related. :NOTSURE:
starkers