Audiolab.. wrote:"most world class dacs sound best with transports that you do not use an inferior cable like usb"
Its not the cable that is usually the limiter here. Its the USB interface design and associated clocking circuitry. Most USB DACs have inferior USB interface designs, but a few are world-class. Its a lot like vinyl cartridges. Some are great and most are just mediocre. The Empirical Audio USB interface has won many shootouts and best of shows, including this latest shootout:
http://forum.audiogon.com/cgi-bin/fr.pl?ddgtl&1398132150&&&/Absolute-top-tier-DAC-for-standard-res-R
Good cables for USB include the Revelation Audio Labs and the TotalDAC. Not cheap, but great performance. Buying a good USB cable alone, is not sufficient however. In addition to the USB cable, the common-mode noise must be addressed on the USB cable. This is the noise on the ground wire, not the signal wires. This can be addressed with a USB cable filter like the Empirical Audio Short-Block, or for USB interfaces that use the power in the cable, a filter/supply like the Power Block from Empirical Audio.
BTW, an excellent cable for S/PDIF coax is the Empirical Audio BNC-BNC with RCA adapters. Beats all comers at only $250.
Several of my DAC customers have actually sold their vinyl setups when they got my Overdrive SE DAC. Its only a matter of choosing the right equipment.
The question of whether computer audio can be great or not is silly. The answer is that there are no technical roadblocks that cannot be overcome, just like other technologies. Just requires a clever, experienced designer.
Steve N.
Empirical Audio