In an effort to preserve a piece of audio history, I have PDFed an article written by Rehdeko about their philosophy behind designing their loudspeakers. This article is very interesting and I find it to be as valuable as the literature Paul Klipsch used to publish back in the day. Please remember this article was loosely translated from French, so when they say "measurements that slice" laugh a little!
http://www.concertsoundusa.com/hifi_history.htm (the first link on the page)
For those who are not familiar with Rehdeko loudspeakers, they were a French outfit that made a line of revolutionary single driver/full range loudspeakers in the 80's and 90's.