Alan has stated many times comb filtering is a measureable by-product but has little to do with actual listening experiences.

I for one have not had any issues with my VP150, M80s nor the VP100. Yes the Vp series does drop of by a db or 2 off axis as does any other horizontal design speaker.

Where is that Center channel speaker choice article on Audioholics.........

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70