Sure, Randy; if it's convenient, give it a try to see if the effect of higher mains and wider subs is good, bad or insignificant. Height speakers though, don't have any connection with the height of the mains. The material derived for the height speakers from 5.1 or 7.1 movie sources is derived from the surround channels, not the front channels.

Also keep in mind the principle of having the center of the woofer cones at different distances from the room boundaries.

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Enjoy the music, not the equipment.