Orei DA50 DTS/AC-3 Digital to 5.1 Analog Audio Decoder Connect to home theater or a 5.1-channel power amplifier (FL/FR if 2.1 channel). USB output: Supply 5V power to 5.1 Channel Headphone. The analog stereo (L/R) signals after digital processing chip handle convert it to analog 5.1 channel output Multi-Channel audio input (SPDIF , Coaxial, Stereo) 2 x SPDIF input, 1 x Coaxial Input, 1 x Stereo Signal to Noise: 120db Degree of Separation: 85db Frequency Response: (20Hz ~ 20 KHz) +/- 0.5db Max Output Volt: 2.2V Easy to connect many entertainment devices which with optical and coaxial digital signal and analog output signals (such as: set-top boxes, HD players, Blu-ray DVD, PS2, PS3, XBOX360)