This has been said like 3 times before, a bus powered DAC is more or less (depending on how good it is) susceptible to USB power noise (depends on the motherboard, PSU). No fancy audiophile cable is gonna fix that. But nobody's disputing that power isolation can be helpful in some cases, though personally I'd tackle the noise/susceptibility problem directly.
The isolator you posted is more of a device than a simple USB cable. It is also fairly cheap compared to the expensive crap some companies sell.
Still, an USB cable audiophile would argue that the cables to and from the isolator box in the middle are of low quality and you have to upgrade those cables to "get the most out of your system" (I love that one). That's what this thread is about.
Edited by xnor - 7/31/13 at 6:41am