I have to check if there is a new firmware update or not. Right now, the home theater setups can use dual subs but the Fives cannot. That’s a weakness of the Five.
In stereo mode, you can run them vertically (where the side firing tweeters are disabled) or horizontally (where the side firing tweeters are present).
The Five’s don’t go low enough for the sub to work great solo, so I really wish they would allow dual subs.
The other issue is that if you have high res music in your local network music library, the Sonos cannot play it and more importantly, it can see the file and try to play it which causes an error. It would be better to hide the incompatible files or do real time downsampling.