I’ve haven’t had any problems with the V4 150 or 180 … but I’ve only listen to content. I have sat in all the seats and these centers sounded great in each. A kind of interesting data point is that to date I’ve haven’t ever experienced comb filtering in any speaker setup … I guess I’ve never gone looking for it. I figure it must be pretty subtle if you need specific content (pink noise) to find it. But that’s just been my experience… your mileage my differ.