Shouldn't this be in Fight Club? Now we're comparing amplifiers? Much of the high-end gear I've owned over the years (ML, Krell, ARC, etc.) was poorly or minimally spec'd. At some point I suppose it just doesn't matter since the specs are typically far better than what we could notice as distortion anyway. And some of the gear I measured was grossly under-spec'd, almost like they took pride in publishing specs like THD of <1 % even when it was 0.001 % at typical levels.
As for whether folk can hear 1 ps of RJ on an audio DAC clock, I'm from Missouri, show me the DBT results. The aperture time of a 24-bit DAC at 20 kHz is about 0.5 ps so you're around the 1/2-lsb level of a 24-bit converter at 20 kHz. That is, 1 ps lops off about a bit, leaving you with a measly 140 dB or so of SNR. It scales linearly with frequency so at 2 kHz you'd need 5 ps for the same level of noise, 10 ps at 1 kHz, etc. Every time I've piddled with this in simulation or the lab, any audible difference has been traced to other things and not jitter, leastwise not jitter at this level. And that was with test tones; the JND threshold is much higher with a real-world source like music.
