TC-7510 Digital Optical / Coax to Analog Stereo RCA Audio Converter, Headphone Amplifier Audiophile DAC Works with PCM stereo source signals (does NOT accept Dolby 5.1 signals) S/N ratio: &gt;103dB; Channel separation: &gt;I00dB@ 1000hz; Frequency response: 20hz 20,000hz Inputs: two Toslink (optical), two RCA (coaxial RF) Outputs: one headphone (1/4 stereo, variable), two RCA stereo (one variable, one fixed) Dimensions: 9.82