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If we're back to the main subject of getting rid of "hiss",...

my advice is first to try to find the source of the hiss and fix it there, not at the speaker terminal. But now I am a bit confused as to whether you have an inordinate amount of hiss or you're just pursuing perfection (no hiss ever), which eludes most of us. Plus, my thoughts on the lo-pass filter are still the same; you cannot filter out hiss as we know it without losing gobs of musical information in the process. As to this specific question, the value of the capacitor will determine the -3db point of the filter. This is a first order function. So, a 0.1uF capacitor will place the roll-off frequency 10X lower than for a .01uF capacitor. .01uF is safe for musical information; it won't be lost. At 0.1uF, you'd have to listen for yourself. But it really does not matter; we know for sure that hiss is in the audible range, where music lives. You cannot eliminate one without eliminating the other. Which goes back to fixing the hiss at its source.


Edits: 07/28/16
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