Apogee Duet, but mine is/was the original firewire 400 one. This is a gorgeous DAC- understated and transparent. I think it is better, much better than the Lavry DA11 which cost almost 3 times as much. It sounds great with the Audio Technica ESW-9 the lower end HP with wooden cups, I reckon this HP sounds crap with everything else I used it with- too much bass. I'd still be using with a pair of Adam A5 powered monitors if I hadn't tripped over a RCA lead and left a pin lodged in the socket- bummer.
I also have/had a great Marantz PM-75 from 1990 with the 15 or is it 14 bit Phillips TDA single crown chips. If you run digital files through it, it sounds the same as the identically chipped and fabulous CD-80.
Alas, my brother, niece and nephew are in possession of all my stuff now since I'll be saying adieu to this metropolis of narcissism and living out of a suitcase for the indefinite future.