Gunbei,
My biggest issue with usb were the dropouts. I couldn't get into PC sound as I was just waiting for a stumble. With firewire, there aren't any hiccups at all. The sound with firewire is just more flowing, more musical. I get a nice soundstage, low level resolution, slam, presence of the instruments, air - all which was missing from usb. I don't know of any firewire dacs. I use an MAudio firewire to spdif converter into my dac. Two other issues - first, with firewire, you aren't limited to dacs with a usb input - any dac is fair game. Second, and more improtant - usb was never intended to be used for audio pass through, while firewire was. USB was created to hook up peripherials (printers, mose, keyboard, scaner, etc) and nothing more. USB transmits packest of info - which is't the way to go for pc audio. Firewire streams the data. Much, much better.
My biggest issue with usb were the dropouts. I couldn't get into PC sound as I was just waiting for a stumble. With firewire, there aren't any hiccups at all. The sound with firewire is just more flowing, more musical. I get a nice soundstage, low level resolution, slam, presence of the instruments, air - all which was missing from usb. I don't know of any firewire dacs. I use an MAudio firewire to spdif converter into my dac. Two other issues - first, with firewire, you aren't limited to dacs with a usb input - any dac is fair game. Second, and more improtant - usb was never intended to be used for audio pass through, while firewire was. USB was created to hook up peripherials (printers, mose, keyboard, scaner, etc) and nothing more. USB transmits packest of info - which is't the way to go for pc audio. Firewire streams the data. Much, much better.