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The main benefit of Firewire is it handles 24/192 , USB will only do 24/96 at this time. A well designed DAC, such as the Benchmark, will handle USB jitter issues
Their consumer division's Minerva and Vesta converters both accept only FireWire or S/PDIF and provide an AES/EBU and S/PDIF output, with the Minerva also offering both balanced and unbalanced analog outputs.
President and Founder Daniel Weiss was on hand to demonstrate the products connected to an Apple notebook and using iTunes with the Amarra music server software to get high resolution files out to the FireWire port.
The Vesta retails for approximately $4,300 and the Minerva around $5,000.
From my experience with Metric Halo gear, Firewire does seem to sidestep the timing issues in streamed audio via USB, other than in the new Wavelength, Ayre, and dCS DACs, which use the protocol's asynchronous mode. Daniel Weiss's earlier AES/EBU input Medea processor - search for the review in our free on-line archives - was one of the best-measuring I have encountered, BTW. I am hoping to get an Amarra system for review.
Actually only USB 1.1 is limited to 96/24. (In fact, it could do more, but it would be non-standard -- like 192/20 for example.) USB 2.0 can easily do 192/24, but the only problem is that only Mac's have the native drivers to do this. Windows and Linux require custom drivers. This will get fixed soon. And FireWire is disappearing from most computers. It's kind of like SCSI was -- a nice high-performance interface, but too expensive for the mass market. So it disappeared.