UD-507 DAC, Preamp, Headphone AmpA part of the TEAC's 500 Reference series, the TEAC UD 507 DAC, Preamp, Headphone Amp combines the functionality of three separate units into a single chassis for an unparalleled high resolution listening experience. The new TEAC UD 507 has been completely redesigned embracing the high end 700 series design concept in a compact A4 size package. It's got everything an audiophile would need: High quality affordable DAC, features for high resolution