Thanks guys for the quick replies- yes, I do take the plastic off when I play 'em .
The buzzing noise is rather finicky- it only comes out of one of the sats, and I just checked, and the noise disappeared- sometimes it's loud and sometimes it's inaudible.
All connections are tight, and pretty sure not soundcard. As for interference, if it were interference, would it just come out of one satellite?
Thanks everyone!