No, there’s is no setup that lets you use a Sonos soundbar (or any other soundbar) as a center speaker. Soundbars are by definition the Left, Center, and Right speakers in a single enclosure.
So will I be better off with a Sonos amp rather than soundbar?
I think Amp needs passive speakers, rather than Sonos’ active ones. It will then drive Front Left and Front Right speakers and create a phantom Centre channel.
Just to lay it out clearly, there is no option other than the Sonos soundbars to have three front speakers. The soundbars include all three in a single enclose, the Sonos Amp requires two passive speakers, and creates a ‘faux’ center channel by sending that data to both right and left.
