Two are the devices used: data resynchronization and magnetic separation of the ground. The first solution allows different methods to release from the transmission on USB, using on-board reference oscillator with low jitter of the DAC is capable of re-clocking of incoming data from the computer with absolute precision. The second solution allows to completely decouple the ground of the computer from that of the DAC, allowing the transmission of signals at high speed but without the noise generated by the computer