Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

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Re: Your player already has fairly low jitter measurements

Posted by Christine Tham (R) on March 16, 2007 at 21:33:57

In Reply to: Re: Your player already has fairly low jitter measurements posted by Charles Hansen on March 16, 2007 at 19:59:53:

I haven't seen or heard your player, Charles, so I can't comment on how it compares with the Sony.

However, the original topic was whether there were any ways of reducing jitter on the Sony, and I can state with some confidence based on my knowledge of that player that Sony seems to taken reasonable care that department, and the "proof" (for what it's worth) is that it's one of the lowest measured by Stereophile.

Does that mean it sounds better than your player? Not necessarily. Would it measure even better if we used something other than the Miller unit? Perhaps, perhaps not.

It's interesting that you suggest that perhaps the Stereophile tests show a pattern over the years. If that is something of concern to you, you could ask John Atkinson to remeasure your player and see if the results are significantly different. But I didn't think your player measured that poorly - seems to be in the same league as other players based on a Pioneer platform (like the Bel Canto for example).

It would be interesting if all Pioneer-based players do measure roughly the same, because it would imply that the main constraint to jitter performance is upstream (close to the optical drive or media decoder) rather than downstream (close to the DAC). However, I don't have enough evidence, so that's just speculation on my part.

PS - I like your idea of using separate clocks. I'm using the same idea in my player - the only problem is the DAC needs to be "reset" everytime the clock is switched. On my player, this effectively requires a number of other chips to be reset as well, so it's a fairly intrusive (and potentially error prone) operation. On rare occasions (I have only encountered it 3-4 times so far), the clock switch is not successful, and I lose audio output. Have you had any problems switching clocks? Can you do it on the fly? (ie. can you switch between 44.1 and 48kHz on a single disc whilst it is playing (for example, switching between audio tracks on a DVD-Audio)?

Most of the pro audio equipment I have seen with separate switchable clocks require a power cycle to effect the switch. For example, my SD90.

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