Like Thomas said, the Delta 15's really need a large box to keep 'em right. Delta Pro's are a little bit different animal. Generally compatible, but different. Either way, for the Theater fours and sevens, if you go smaller, the system will be underdamped and it'll suffer some peaking.About the catalog, I think if you'll write to someone in the "contacts" section of the Eminence website, they'd be happy to send you their new 2003 catalog.