External 7.1 USB Audio Card SPDIF Ready

External USB sound card delivering native 5.1 and 7.1 channel audio output with full SPDIF optical I/O capability. Built using PC-grade components as part of a broader 'PC+sound card+amplifier' ecosystem. No explicit dimensions, weight or material details provided in source — but confirmed to include three input terminals (one fibre optic), three analogue output terminals and one fibre optic output terminal. Supports 32kHz/44.1kHz/48kHz sampling for recording and playback; optical output limited to 48kHz (requiring conversion for 44.1kHz DTS-CD content). Fully compatible with Windows 98 through Windows 8 and Mac OS 9.1 (stereo-only mode). Complies with USB Audio Device Class v1.0 and operates at full-speed 12Mbps over USB 2.0 (backward compatible with USB 1.1). Intended for HTPC setups, home theatre enthusiasts, gamers and karaoke users seeking improved audio fidelity beyond built-in motherboard audio — also functions with standard headphones for real-time voice communication.