Cf, as far as imaging goes, if a singer is in the center that's usually the way it's supposed to be.

That 200W rating is a maximum; most of the time the speaker would be using about 1 watt. 90 would be plenty.

The general rule for placement would be to have the main speakers separated by about the same distance as you are from them. Then toe them in slightly so that the tweeters are pointing at your ears.

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Enjoy the music, not the equipment.