Explain this

umm.... cus most people are sitting when listening.

You can adjust the beam of which your tweeters fire by adjusting the rake angle of each speaker. This is an often overlooked and critical apect of speaker placement. This has been a subject here on the Gon as well as other forums. Go here: Iron Chef Speaker Setup

Boy I hope you didnt waste too much time trying to figure this out, nobody is the same height so there is room for adjustment as others have noted.