and later to
I'm not sure if I have understood your problem correctly. You refer
Everything I tried to get rid of the hiss failed ... apart from
disconnecting my loudspeakers from the soundcard. That would work, but
it was not very practical. I suppose the metal coils in the speakers
acted like a kind of antenna for the interference.
So for a while I just notched out 8000khz and 6000khz where the hiss
occurred during recordings. As it had very narrow bandwidth, I could aim
the filter right at it and not loose much of the rest.
Then two months ago I upgraded my speakers, and no more hiss :-)
I'm not sure if I have understood your problem correctly. But if it's
high-pitched and seems to appear randomly, you could check for something
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