This is the latest creation from Burson Audio, a standalone DAC - with two USB inputs, one coax and one optical. Maximum resolution is 192 kHz / 24 bit on the coax and optical input, 96 kHz / 24 bit USB.

And with this in place I now have the ultimate Burson setup :D

Source: Squeezebox Touch
DAC: Burson DAC-160
PRE: Burson PRE-160
Power: Burson PP-160
Head-fi: Burson HA-160, AKG-702
Speakers: MonoPulse 42A

USBView

Under the hood. Here is a dump from USB View where the DAC is connected to the first USB port (U1):

http://dl.dropbox.com/u/12431334/burson-dac-160-usbview.txt