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發表於 2013-12-17 11:40:18
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That is the fundermental differences on the async USB vs. normal AES/EBU connection.
It is almost impossible to objectively point out which clock is "better".
In theory, with decent circuit design, the internal clock nearest to the DAC is the best one. This is what I usually suggested since I think my target audience most have decent DACs.
Crystal oscallitor has specifications, but a crystal does not work alone. Its specification and performances can changed dramatically because of the power supply ripple, servo, PCB layout. The oscillator vibrates at very high frequency may affect the analogue amplification section.
Atomic clock is another example. It is super stable that drifts 1sec every 1000years. But it outputs at 10MHz and does not suitable for audio application. It requires PLL to alternate (pull) to suitable frequency range, which is complete changed its specification. This PLL maybe even more important than the atomic itself. If an atomic clock sounds superb, there are 2 reasons. One have been fascinated by the term "atomic" or the unit actually designed very well as a whole, especially on PLL, signal layout and power supply.
Here is a S10 jitter measurement made by HiFi News (UK): http://designwsound.com/dwsblog/2012/04/aurender-s10-jitter/
W20 has a better design (if one would think S10 is still not ideal), and W20 has an external USB to Serial connection device to pair with dCS master clock/units.
We are building a new review archive but you can read some reviews on W20 here:
http://www.squarewaveltd.com/main/review/
With MSB DAC, i think either USB or AES/EBU will sound excellent. If the MSB doesn't accept DoP through AES/EBU, then using USB is quite obvious choice.
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