Amazon.com: 4K x 2K HDMI Audio Extractor Splitter, HDMI to HDMI Audio Converter Adapter Support Ultra HD 4K Toslink Optical Audio Output and 3.5mm Audio with Optical Fiber Cable : Electronics
Optical Audio Adapter | Sonos
HDMI Active Optical Cable 4K 18Gbps - 150 Feet
HDMI vs. Optical: Which Digital Audio Connection to Use? - CNET
25ft (7.6m) C2G Performance Series High Speed HDMI® Active Optical Cable (AOC) - 4K 60Hz Plenum Rated | C2G Performance Series HDMI Cables | HDMI | Audio Video
HDMI Splitter Audio Extractor, 4k@60Hz 1 in 2 out with HDMI Optical Toslink SPDIF + HDMI 7.1CH + 3.5mm Audio Out for PS4 Xbox One DVD Blu-ray Player HD TV Projector - Newegg.com
Hosa HAOC-416 High Speed HDMI Active Optical Cable 4K 18 Gbps 60 Hz, 16 Ft | Full Compass Systems
Kanex Digital Audio Adapter for Apple TV
IOGEAR - GHDAOC30 - 10K HDMI® Active Optical Cable 100 ft.