You cannot add a dedicated center channel speaker to your Sonos Amp setup. The Amp can only create a phantom center channel using the left front and right front speakers. If you want a solution for “nice clear voices”, I would recommend adding a Sonos soundbar like a Beam or Arc. You could then use your Amp and third-party speakers as rear surrounds. Although you would be unable to use your third-party subwoofer in this setup.

My ears aren’t great and I find the voices in the Arc and Beam, even with speech enhancement on a bit weak.

There is no real way to improve the center channel’s volume although it has been suggested.

Okey thank you guy’s.. :-(

i had brifly connected a Sonos Playbar with my AMP-setup, and if it was not for the echo it made, the Sound was great..

but i just have to return the playbar Then :-(

The echo would go when you set up the system as a surround system.

Yes, i was just trying to avoid that, because i Then would have to loose the subwoofer if i chose that option. :-/