The tube like sound is complete, airy, dynamic, lively, and incredibly musical. The purity of human voices and accuracy of instruments is breathtaking. The Roma37DC+ with its 450W, provides a fast, dynamic presentation without the dryness and sterility of other Class D designs. This is due to the 6DJ8 tube input stage and the natural sound of the class D audio module. Resolution, transparency and detailed sound are above and beyond that which one would expect from an amplifier. The Roma37DC+ has USB "B" type, DSD 5,6MHz and optical input. 32Bit resolution gives you a fantastic sound stage and beautiful sound reproduction. The MM phono stage combines exceptional sound quality and unique features.