My centre speaker is a Kef iQ60C, in dark apple, very nice! My new AVR Marantz SR7011, when running Audyssey says that it is out of phase. A previous AVR, a Sony 3500ES, from a couple of AVR's ago, also said this. I have checked the cabling many times and it is definitely not wired out of phase. But I have been running Audyssey a lot lately, due to messing with my system and trying new power amps / integrated amps out. So, out of curiosity, I wired it out of phase, to see what happened. And Audyssey now doesn't issue any phase error warnings. The speaker sounds fine, similar to how it did before, maybe slightly less boomy on male voices, but I might be imagining that. Question is, am I okay to leave it wired out of phase, or will it blow something up?!