Pro-Ject Audio - Head Box DS - D/A Converter and Headphone Amp - Silver 1x analogue output (use unit as D/A converter) ; 1x analogue input ; 1x USB input (24bit/96 kHz asyn 1x digital coax input ; 1x digital optic input ; 1x 6,3mm headphone output Big elegant control display ; Ultra low-noise semiconductors from Burr-Brown SMD technology for short signal paths ; Signal to noice ratio -120dB THD &lt; 0.0014%