HDMI (eARC & ARC) to HDMI, Optical Toslink SPDIF, Coaxial L/R Analog Audio Converter With 3.5mm Jack Support Headphone/Speaker Outputs - HDMI ARC to Analog Audio Converter - Newegg.com
Disable CEC Function
HDMI ARC and eARC: Audio Return Channel for beginners - CNET