Replacement Audio Cable For 5.1 Channel Logitech Computer Speakers 3.5mm 1/8 Trs Plug Male To Male 6ft - Audio & Video Cables - AliExpress
Help Guide | Connecting 7.1-channel speaker system using surround back speakers
RCA Surround Sound: Analog 5.1 Audio Explained | Home Cinema Guide
SOUTHSKY 5.1CH Digital Sound Surround Decoder,2 Optical SPDIF,Coaxial,3.5mm Jack to 5.1 Analog Audio Converter,6RCA Output,Support Dolby AC3,DTS,Compatible with DVD,PS2,PS4,Xbox,HDTV,Amplifier : Amazon.co.uk: Electronics & Photo
5.1 Audio to an old sound system. : r/ShieldAndroidTV