Ken, it's just a variation on my previous reply to Matt, when I pointed out(and astonished Peter)that it's good practice to set the speakers so that the midwoofer cones are different distances from the floor and the 2 nearest walls(e.g. 1, 3 and 5 feet). Where the speakers are so high that the mids are closer to the ceiling than to the floor, the measurement to the ceiling would be used instead.

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Enjoy the music, not the equipment.