The USB interface only use USB power to work! AKM DAC and good OPA op-amp. Xmos DSP for USB interface. Sound better than Lexicon IO22 to me. I use a Presonus R65 and it sounds very good for a recording system under window.
The ID input use a Jfet J112 from Fairchild. The output use two pairs of BC327 and BC337 to drive the output.
Its bigger brother ID14 and ID22 use burr brown ADDAC but this little brother only use the AKM parts. Cheap and good for this price point USB interface.
