I read a recent review, where the reviewer stated his preference for having the surround tweeters at ear height, even though most recommendations are to have them 1 - 3 ft above. So if I have mine at about 15", if I put my speakers upside down, that would change to about 1.5" above ear level. But what does that do to the woofer and imaging and such? I know that some bookshelf speakers specifically have woofers on top, but they are obviously designed that way. Anyone know? Thanks!