Theta DS Pro Prime IIA DAC in pristine condition with superb audio rendition. Used as upgrade for high-end CD player and with computer music server in high-end audiophile system, Quad ESL speakers. Replaced Bel Canto DAC. Sound for serious music lovers; used for critical listening and to audition classical recording masters recorded live in Sanders Theater and other Boston venues ; especially fine reproduction of voice and strings. Tight deep bass and smooth extended highs. Digital done right.