The sub thing is probably their way of making you do it right. If a typical speaker's six inch driver responds to LFE it's going to be abused or distorted once given any substantial volume, so it insures performance and their subs do sound great. Everything except the cheapest round in-ceilings are sealed enclosures. I love Triad it's been my rock since day one of my going solo with my integration service. Staff there is terrific. They really take care of you and give it the feel of a small hometown business.