Not really two "sweet spots". A single center channel speaker keeps the center material imaged directly in the middle of the screen, regardless of whether the listener is off to the side. Using two separated(sidewise)center speakers keeps the image in front of the listener who's off to the side, but it's no longer in the center of the screen where the voices etc., are generally supposed to be coming from, so that probably shouldn't be termed listening in the sweet spot.

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Enjoy the music, not the equipment.