The big advantage that firewire has over *current* USB2 specification is that it has the concept of bandwidth reserved channels and there is less prone to other applications and data interferring with your audio streams.
USB2 audio class devices current (as far as I know) do not support the concept of assured bandwidth channels.
USB1.1 on the other hand does - there despite the lower bandwidth of USB1, it *may* actually be a better choice than USB2 for a small number of audio streams.
Thats said, the overall disadvantage of typically current USB hardware (whether v1 or v2) is that it *seems* that drivers have to do more work for audio applications.
Also firewire has been proven to provide *very* low latency with dedicated hardware at each end - ie mLan, though I am not sure if when mLan devices are at both ends of a firewire link wherther firewire is still used - I see no reason it shouldnt be.
I should add - I am not inteimately familar with the specs of either interface system, but the above is my best understanding of them, but could be wrong.
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