USB Cable with No Power

"Who makes such a cable? "

- Entreq. They developed USB cable(s) for $100k dCS and we work with them.

Simon
Musica Pristina

"First you must understand that desire not to use PC power is the desire not to carry ground noise to your DAC"

Not true. Even the USB cable with no power wire in it still needs a ground wire in it or it will not work.

Revelation makes an unpowered cable. You can purchase it on:
http://www.empiricalaudio.com/products/off-ramp-converter

The only way to reduce ground-noise with this type of cable is a common-mode filter, like this:
http://www.empiricalaudio.com/products/short-block

Steve N.
Empirical Audio

"Even the USB cable with no power wire in it still needs a ground wire in it or it will not work "

Exactly. This why Entreq USB cables I recommend have a ground wire(Eartha) as well as the grounding box (Maxumus).

Simon
Musica Pristina