The "Continuum" by Jeff Bagby
One of the more sought after kits from Jeff Bagby which models the LS3/5a system origianlly designed for the BBC in England. See the write-up in the pdf below for design details.
The full kit constists of everything you'll need except the cabinet. Cabinet plans are included. A Bare Bones kit is available, which gives you just the drivers and crossover parts.
A fully assembled and tested crossover option is available.
What you get: