My brother is building a theater and I've talked him into an axiom setup. He wants inwalls.

Room will be 16x19. Two rows of seating

I was thinking it might be cool to do 3 W3s across the front for a seamless soundstage. Why do you really need a horizontal speaker as a center anyways?

The other options are W3s and W100 / W150.

He could also do W22s and a W150.

QS4s or QS8s and a SVS cylinder sub would round out the 7.1 system.