Hi

That setup is not possible. The Arc is designed to deliver left/right/center and Dolby Atmos effects via upward and side firing speakers. The Arc cannot be configured to act as center channel only ( nor your proposed setup). By the same token no Sonos sound bar (current or discontinued models) can be configured as such. 

All said you can use Sonos One SL’s as surrounds and Two Sonos subs. At least one sub has to be a Gen3.

And, to reinforce what @AjTrek1 indicated, there is no situation in which a single Sonos speaker can be used as a center channel. All of Sonos’ soundbars have Right, Center, and Left channels in a single enclosure, and a center channel can not be ‘split out’.

I have a question:

I plan setting up 1 arc, 4 passive wall speakers “2 fronts and 2 back”, and 1 sub.

Is it possible to set up  with surround sound?

@kevindangloc no it is not 

The above answers apply