I just saw the Axiom video on turning the center channel on the beveled side (to angle it up). But the video shows the person rotating the tweeters 180deg. Is this necessary for aesthetic reasons or does it affect the sound?

Looking at the speaker itself, I can't imagine it would affect the sound quality.

Does it matter?

The video is under Articles, Video, Center Channel Placement (last one)

Thanks

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Denon 4520, EPIC80/500/VP180 Speakers