I have two Play:5 speakers and a Sub in my living room and I recently got a projector for that room. Right now, I’m using a Bluetooth receiver device connected to the 3.5mm TRS jack on the back of one of the Play:5s, but the Bluetooth connection is unreliable and due to the nature of Bluetooth, there is a slight audio delay.
It would be great to be able to connect the projector directly to my Sonos system without Bluetooth. The projector has an HDMI-ARC port, and a few Sonos devices support ARC. A device that connects to an HDMI-ARC port and only acts as an “input” for a Sonos system would be very useful for my configuration. It’d be even more convenient if it had an option to be powered over PoE (but I won’t be holding my breath on that).