Feature Supports AES/EBU, IEC 60958, and S/PDIF Supports true 5.1 and 7.1 channel audio output; compatible with 5.1 speaker systems Sampling rates up to 48 kHz (32 kHz, 44.1 kHz, and 48 kHz supported for digital recording) Fiber optic output supports 48 kHz sampling rate only; DTS-CD at 44.1 kHz requires sample rate conversion for playback Compatible with Windows 98/ME/2000/XP/Vista/7/8 and Mac OS 9.1 (stereo output only on Mac) Enables full-duplex audio playback and recording without requiring an internal PC sound card USB 2.0 interface, backward compatible with USB 1.1 Complies with USB Audio Device Class Specification v1.0 Supports USB full-speed data transfer up to 12 Mbps Three input connectors, including one optical (TOSLINK) input Three analog output connectors plus one optical (TOSLINK) output Outputs: 5.1-channel analog + S/PDIF optical Designed for use with PC, external amplifier, and 5.1 speaker system Ideal for home theater PCs (HTPC), movies, gaming, and voice communication Optical output enables AC-3 or DTS surround sound when connected to compatible receivers or 5.1 active speakers Package includes: 1 × Sound card