I'll bet your humidity is under 10%. Where do you live? Use a lot of air conditioning? Does this happen spontaneously, or only when you touch a component?
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OK, so are you saying that when you walk across the floor in your socks, or you put on or take off a wool/down jacket, these noises come out of your speakers? Or does it happen other times too?
The reason I ask is I'm not sure the problem is "static in the room" as you put it. The other two possibilities are radio frequency radiation (which can come from many sources besides radio transmitters) and line-bourne noise on your
AC power line. Both of these things can be addressed with proper filtering devices.
When static build-up discharges, it sends out radio frequency energy. And I can only assume that something in your system (more likely cabling than the components themselves) are acting as an antenna.
Does this only happen when certain sources are selected, or with any source?
And BTW, is your system not grounded? Are your wall outlets grounded type, and are the grounds working (connected to a real ground or a ground wire back to the electrical panel?)