Simplified MFG DAC1 HDMI audio extractor with multi-channel-to-stereo downmixing at Crutchfield
Amazon.com: J-Tech Digital ® Latest Generation Multi-Functional HDMI Audio Extractor with 8 Inputs to 1 HDMI Output with Optical/Coaxial 5.1 Channel Support 3D & Surround Sound : Electronics
HDMI 2.1 Enhanced Audio Return Channel (eARC) is a Future-Proof Solution – Display Daily
HDMI ARC and eARC: Audio Return Channel for beginners - CNET