The iFi nano iDSD DAC also doubles as a battery-powered 80mW headphone amp and can handle PCM resolutions up 32/384, DXD, single and double rate DSD and with a recent firmware upgrade even quad rate DSD. Unlike the recently reviewed Geek Out DAC (see review
) and some of the other micro DACS, the iDSD is not a micro DAC per se coming in about the size of a pack of Camels. The cigarettes, not camels. Also like the Geek, there's a physical volume control but here its handled in the analog domain, USB in, and because of its bigger body its able to accommodate a pair of RCA outputs instead of the 3.5mm minijack found on the Geek Out. iFi also throws in a Coax output and two filter choices; minimum phase recommended for listening and "standard" recommended for measurement.