PROZOR HDMI Audio Extractor 4K@30Hz with IR Remote 3 IN 1 OUT HDMI Optical Adapter HDMI to Optical Toslink 3.5mm L/R Audio Converter Support 5.1CH for Blu-ray DVD PS3/4 HDTV Etc: Amazon.co.uk:
QED Performance Active Optical Ultra High Speed 48G HDMI Cable
HDMI 2.0 Audio Extractor, HDMI Audio Splitter 4K HDMI to Optical Spdif Toslink Coaxial and 3.5mm Stereo Audio Converter Support 4K@60Hz HDCP 2.2 HDR 3D for Blu-ray DVD Player PS4 Xbox One :
15M True 4K HDMI Active Optical Cable (True 4K@15m) - VE7832, ATEN Video Extenders | ATEN United Kingdom
Kordz PRS4 Active Optical Ultra High Speed HDMI Cable
Optical vs HDMI: Which Is Better? - RTINGS.com
60M True 4K HDMI Active Optical Cable (True 4K@60m) - VE7834, ATEN Video Extenders | ATEN Corporate Headquarters
Armored HDMI Active Optical Cable (AOC) on Reel 4k @ 60Hz HDR 18 Gbps Waterproof 100M 328ft | Eaton
HDMI vs. Optical: Which Digital Audio Connection to Use? - CNET