Simple. Jitter can mask other system sibilance. If the sibilance is worse sounding than the jitter that masks it, then the jitter is euphonic.
Hmm , that is a bit of a stretch, you might describe it as a hygiene factor, in any case jitter that is so extreme as to mask notable sibilance regadless of etiology would have to be at an extraordinarily high level, way above the levels we normally find.
Lots of systems have high levels of sibilance due to bad silver cables,
I am a bit surprised by this. I have measured cheap crappy silver cables as well as many different copper and SPC cables ranging from 77c to $130 I found no evidence at all of any deterministic frequency alterations from any cable I measured, every cable I tested was functionally flat from 20 - 20K.
poor preamps and even some amps.
...again I would be very surprsied at any competent solid state component that notably emphasises tsss sss and chh sounds , I can understand it in cartridges and some microphones or headphones where mechanical issues might be at play and even in tube CD players with uneven FRs but whenever I have seen any half decent SS amp/pre-amp assessed flat is the operative word, however who knows what happens in the design of boutique garden shed audio. Do you have any examples of particularly poor pre-amps/amps in that respect.
Steve N.
Empirical Audio