Peter Comeau has been making a few very interesting posts over on the World Designs forum (who he used to own before heading off to China) relating to speaker design.
Take a trip over there and look around the WD Speaker threads.
For example follow the link below and pick up from post 25 - his comments on super tweeters now make a lot of sense to me and take away the misconceptions relating to them.
http://www.world-designs.co.uk/forum...?t=7568&page=3
Mel