The USB socket is asynchronous, meaning the DAC handles clock duties, dictating when it receives digital data from the source: the designers say this makes for more efficient data transfer and improved sound quality.
All the major sample rates are catered for – 16-24bit, and 32kHz all the way up to 192kHz for high-res audio files.
That 24-bit/192kHz capability will work over USB with Macs out of the box: if you use a PC, you’ll need to download Cambridge Audio’s driver software from its website.
You’ll also have to switch the DAC’s USB socket from USB 1 Mode to USB 2 Mode by holding down the source button whilst switching it on from standby