I agree with you in every way. The JBL 4430 was an excellent system, and I like the technical approach used by its designers.There's more good information about it and similar systems in the post called "Baffle spacing, phase angles and time alignment, revisited." In fact, excerpts from the AES whitepaper that described the JBL 4430 were used in this post and a link to the AES paper is included there too.