I'm noticing a very slight static-type noise in my front speakers at a very short frequency range. It appears to be near the upper end of male dialogue. This is a VERY slight thing and I only notice it every once in awhile. However, I've noticed it enough over the past 6 months that I don't think it's my imagination. What could cause this sort of thing? I'm running two relatively new Axiom m2i's, so I don't think the speaker is the culprit. Also, I can't seem to reproduce the noise while playing a frequency sweep tone. Here is the path of my sound: HTPC (Augidy 1 S/PDIF out w/ 75ohm cable) -> Pioneer 811S receiver -> Speakers I'm guessing it is a source problem, since I can't hear it in my surrounds, but they're el-cheapo speakers currently, so I wouldn't expect to be able to hear a subtle detail like that in them. Thanks for any help!