I have just purchased a Sonos Beam soundbar, and am having trouble getting the audio feed set-up. I have discovered that my Panasonic TV does not output Dolby audio from its HDMI ARC port, so I must get that audio directly from the audio optical out on the V6. I also have an Amazon firestick going into the TV's HDMI 3 port, so I want that sound into the soundbar as well. I bought a Kinovo 501BN HDMI splitter to take these two audio feeds and output to the soundbar. Now here's the rub - the splitter does not recognise the TV's HDMI 2 ARC output, nor the V6's digital audio out. I have tested the splitter and it passes through the main AV feed from the V6 to the TV. It's as if the feed requires video in order to be detected. I'd be grateful for any thoughts on this.
You need an AVR not a soundbar. The Sonos's HDMI input is for audio from the TV's HDMI ARC port, so that doesn't help you. What you can do is connect the Sonos to the V6 with a TOSLINK cable for audio and the TV to the V6 with an HDMI cable for video. The Fire TV Stick will have to stay where it is until you get an AVR for surround sound.
Indeed, my Onkyo TX-NR509 has four HDMI inputs which looked sufficient several years ago and are now barely adequate. The good news is that your Fire TV Stick should work well when plugged into an AVR, at least my Stick and a Roku both work without a hitch.