HDMI ARC Adapter to RCA Audio Converter Digital to Analog Stereo DAC Coaxial Optical ARC Input to Coaxial +Optical +L/R+3.5mm Jack Output for TV: Amazon.com: Industrial & Scientific
Amazon.com: HDMI ARC Audio Extractor, Tendak 192KHz ARC Audio Extractor DAC Converter, Digital to Analog Audio Converter, Optical/SPDIF Coaxial HDMI ARC to Optical/SPDIF Coaxial Stereo L/R 3.5mm Jack for TV : Electronics
Sonos Optical Adapter OPADBWW1BLK - 878269009252
HDMI-ARC Audio Extractor Converter SPDIF + 3.5mm Jack Output HDR10 [JTD18G-H5CH2] - J-Tech Digital
Optical vs HDMI: Which Is Better? - RTINGS.com
Sonos Optical Audio Adapter for Sonos Beam and Arc OPADPWW1BLK