About the Sonos Optical Audio Adapter
Want to use your Sonos Amp-powered speakers to deliver TV audio, but don't have an available HDMI connection on your TV? Use any standard HDMI cable with this adapter, and you can connect your Sonos Amp to your TV's optical digital audio output.
More details on the Sonos Optical Audio Adapter
HDMI-to-Optical Digital Adapter: If your TV does not have a HDMI ARC input, but does have an optical (toslink) digital output, this HDMI-to-optical digital adapter can be used to get sound from your TV to a Sonos Amp, Sonos Beam, and other soundbars that only feature an HDMI ARC jack. This adapter will still support 5.1ch Dolby Digital and 2ch PCM.