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Studies have shown that we can quite easily hear clock jitter (there are lots of ways jitter can be introduced) down to 500-1000ps (0.5-1ns). Some new studies suggest levels down to even 10-20ps may be audible.
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If you are talking about the Dunn or Hawksford papers these were mathemetical models never empirically tested with actual listeners.
There is no published paper anywhere, to the best of my knowledge , that has **shown** jitter to be audible below 250ns (Ashihara et al 2005) for random jitter or 10ns (Benjamin and Gannon 1998) for signal-correlated jitter, at any frequency.
If there are other studies that challenge this I will be happy to read them.
Cheers
Nick






