USB cables

I appreciate Elberoth2's comment... I have the Vlink feeding a PS Audio DLink III and don't find it provides the same high frequency " air" and deep bass from music server as I can get with digital from a Linn Genki CD player. Looks like time to find a better SPDIF converter.
I've also found that pure silver is king with digital cables... both coax and USB benefit. Even at the cheap end, immediate difference in stepping up from POCC copper to pure silver stranded cable.

no conductor is perfect... unless its a super conductor at close to 0 degrees kelvin. So all of audio science for wires is really about eliminating conductor non linearities at room temperature. The hardest wave to reproduce on a metal conductor is a square wave yet thats exactly what a digital signal is. So yes a USB conductor thats flatter in impedance linearity across a wider frequency range will suffer less digital anomalies. The sad part about audio is that metal conductors for digital is a dead end... they can't handle the frequency extremes as well as optical cables with lasers. Audio needs to adapt the gigahertz technology used by telcom at which point there will no longer be a signal difference if your carrier wave has a jitter error less than 1/1000 %