DAC-50 is a D/A converter board with coaxial, optical fiber and USB inputs. It is designed for installation in a slot on the rear panel of an analog Accuphase component, to provide direct input capability for signals from digital components. Usage details of the board will differ, depending on the Accuphase component in which the board is installed. To ensure correct operation, please refer to the instruction manual of the respective Accuphase component before use.