Tom, that's the second comment by ED that's been brought up recently(the other related to Audyssey)and neither seem to make any sense. As Alan has pointed out, neither spikes nor pads make any difference in the sound; they simply hold the speaker more firmly in place. As far as an "isolation" pad goes, whether enclosure vibrations are partially absorbed in the pad rather than the floor appears to be a meaningless distinction.

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Enjoy the music, not the equipment.