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208.100.141.234
In Reply to: RE: Synergistic Research USB Cable posted by JimOfOakCreek on February 17, 2008 at 14:08:10
All USB DAC's do NOT rebuffer and reclock the data the same way. Some have very shallow buffers, a few bits, and the "reclocking" is either a PLL or ASRC. Neither of these is immune to jitter.
The only USB DAC's that actually buffer and are immune to incoming jitter are: Spoiler with Pace-Car reclocker inside and Wavelength DAC's that support async USB protocol.
What DAC's are you referring to?
Steve N.
If you dismiss dual stage clock recovery PLLs out of hand as not being immune to jitter then there is no sense in re-hashing my original arguments. We'll just go around in circles again. I know John S insists that PLLs are not efficient as well. I don’t buy it but I'll just drop the entire discussion and invite everyone to purchase a $550 USB cable unless they happen to own your above recommended DACs.
Before leaving I will say this. Isn't it remarkable that Broadcast TV, Cable and Satellite can transmit a 1080i signal with synched 5.1 Dolby surround streamed at > 20mbps without error across tens of miles of nothingness but audiophiles have anxiety attacks with pushing less than 20kbps down 1 meter of cable? And reasonably priced dual stage clock recovery PLLs aren't good enough!
Posted by JimOfOakCreek (A) on February 17, 2008 at 20:13:39 "Isn't it remarkable that Broadcast TV, Cable and Satellite can transmit a 1080i signal with synched 5.1 Dolby surround streamed at > 20mbps without error across tens of miles of nothingness but audiophiles have anxiety attacks with pushing less than 20kbps down 1 meter of cable? And reasonably priced dual stage clock recovery PLLs aren't good enough!"
Yea and my Satellite audio / video broadcasts are 100% perfect 100% of the time-I just can't figure out why my english broadcasts look like Japanese lip synching. Digital perfect sound (and sight) forever? I sure am grad I didn't get rid of my old LP's.
I don't have that problem with TW Cable nor with over the air broadcasts (I find PBS always perfect). I don't have Satellite so I can't judge.
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