It could be that the $$$ Usb cable could be very sensitive and is transmitting the noise generated by the mac/usb port that would be attenuated by an inexpensive cable. Computers and USB ports are very noisy devices.
HELP! Static with my Mac Mini / Ayre QB9 system
I just got my Ayre QB9 DSD upgrade back from Ayre. Couldn't wait to put it back in the system with my 2009 Mac Mini. Huge disappointment! I'm playing iTunes through Amarra and the static is unbearable! I've tried moving power cables and speaker cables around and nothing seems to affect the noise. I then took a different Mac Mini I use in the office (latest model... without Amarra installed) and just played iTunes direct to the Ayre QB9. The static was nearly completely gone, but there were still intermittent pops and clicks. Any ideas? Any and all suggestions more than welcome! Thanks!