Does a 3.5 AUX cable carry a 5.1 surround sound signal? - Quora
HDMI vs. Optical: Which Digital Audio Connection to Use? - CNET
Bluetooth Empfänger Receiver 5.1 Audio Adapter, mit 50cm RCA auf 3.5mm – Inateck Official DE
Coaxial vs. Optical Digital Audio Cables
Xtreme Black Audio Cable with Aluminum Connectors | Fiber Optic Conductor | Supports Mono, Stereo, DTS, 5.1, 7.2 Surround Sound | Gold-Plated Connectors in the Audio Cables department at Lowes.com