Jeff Bagby made some forum comments on 2-way vs 2.5-way that are germane to this thread. See Post #5:
Isn't a TMM supposed to be 2.5 way? - Techtalk Speaker Building, Audio, Video Discussion Forum
Want a second or third opinion about your speaker cabinet design or other audio related problem? Post your question or comment on the Technical Discussion Board. Hundreds of technicians, engineers, and hobbyists, nationwide read and discuss electronics related questions each week. We welcome...
techtalk.parts-express.com