Haven't seen this discussed but I need your general ideas about the surface size to place the speaker on. Many stands have something like 6"x6". My B&W 602's are about 9.25" X 12". I have seen no stands with a platform that size. What would you say is the minimum size for my speakers and how do you secure them to the platform? Also, seated, my ears are 37" up. The tweeters are 17" up. I assume I need 20" stands? If I had to go higher or lower a bit, would higher be better for general hi-fi usage?