Hello, got the same feeling. I used my CD player Cyrus CD6S connected as drive through toslink (very basic one) and it seems to sound better than USB (windows XP). However I suspect that USB link is very sensitive to the quality of cable, and even if the stock cable is not very bad, significant improvement should be obtained with a top quality USB cable. Any advises on good quality price ratio USB cables that can be used in relation with the 15.32 ?
I have tried 5 usb cables and I heard no difference.
The PC can influence the sound, some of the PCs I have tried are just better than others as transports.
Also note that for me WIN7 sounded better through usb than WIN XP.