Hi Whart,
I heart from the dealer big Acapellas, and always felt like horn speakers are performeing much better in a middle size environment rather that big spaces, they throw very large soundstage, on small places soundstage became much more sorraunding, more 3D. I guess at least 1/3 spaces (proportion between speakers distance to side wall) would be ideal from side walls. Maybe placing more upfront would be better? I would use some acoustical theratments too. Anyhow you made nice listening room
