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A little knowledge is a dangerous thing

<< I spent about 15 minutes summarizing the results for recent hi-rez players and the figures are very sobering >>

The transport mechanism itself has virtually no effect on the measured jitter as reported by Stereophile. The primary factors are the clock, the power supply, and the PCB layout (including grounding).

<< I think the fact that the Sony players only play CDs and SACDs (and are not modified DVD transports) are quite illuminating, and suggest that a universal transport does indeed compromise jitter performance. >>

Actually, there is no such thing as an "SACD" transport. They are all DVD transports. The only difference is that on the decoder board there is an extra chip that monitors the analog output signal from the laser to allow decoding of the pit-width modulation.

<< The Esoteric DV-50 would stand out as being a particularly poor performer, despite the R&D invested by TEAC. >>

The DV-50 uses a Pioneer transport. The only thing that Teac does is replace the "bridge" that holds the disc clamp. There was essentially no R&D.

<< When you consider that recent analysis suggests that jitter needs to be below 20ps to be truly inaudible, the above figures suggest that ALL curent hi-rez players are at least an order of magnitude above ideal. >>

You are trying to compare apples with oranges. Stereophile has used the Miller Audio Research test suite for the past eight or ten years. This methodology always shows a higher jitter level than other methodologies. Go to the Stereophile website and look at old reviews. They used to use the Meitner jitter analyzer that would often yield measurements below the 30 pS range.

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