This is one of the most sought aftered vintage DAC by Parasound and it competes with the modern offerings that cost much more. Just do a search on Head-fi.
Digital Input: 2 coaxial, 1 toslink, 1 AES/EBU
Digital Output: 1 coaxial
Analog Out: 1 Unbalanced RCA
Analog Input: 1 Unbalanced RCA
Asking $350 + shipping
No need for introduction here. If you're looking, you know what the M^3 with the dedicated S11 PSU can do. This M^3 has a vented cover, 1 set of RCA input, and 1 set of preamp out. There is a knob for switch the gain of the M^3 between 2 and 6. The opamps used are OPA627s.
Note: The M^3 does not hiss with either the Westone ES3X (reported by previous owner) and the JH13 (what I used it for).
Asking for $420 shipped