Converts a digital audio output (from a DVD player, set top box etc) into a standard stereo line level signal for connection to a stereo or commercial amplifier system. Both coaxial and optical (Toslink) input connections are provided. The internal low noise digital to analog converter ensures no signal degradation. Standard stereo RCA output. Includes power supply.Important Note:For this device to work, the audio settings on a DVD / Blu-ray must be changed to output a lossless PCM digital signal to the coaxial and / or optical outputs. It will not work if another output format is used e.g. Dolby, DTS HD. Supports Digital Audio Format: LPCM (Linear Pulse Code Modulation). LPCM is part of the international standards for DVD, Blu-ray and HDMI. With any setting other than PCM, the signal error LED will light up. With audio output parameters set to PCM, the device will convert a digital 5.1 surround signal input to analogue stereo output from the device, and then into an A/V receiver amplifier or stereo system.