(edit: oops, sorry for the double posting Ed!)
Zaph's listing:
Zaph|Audio
B&C DE10 horn driver w/ME10 horn
Seas 29TAFW, Parts Express 10" 75 degree waveguide
Design based on Waveguide:
Zaph|Audio
Blog section - scroll *way* down (February 5, 2010 posting):
Zaph|Audio
Seas 27TFFNCG in an 8" PE waveguide
SB29RDCN-C000-4 in an 8" PE waveguide
(January 24, 2010 post):
SB29RDCN-C000 modified MCM 6.5" waveguide
SB29RDCN-C000 modified PE 10" waveguide
(November 26, 2009)
SB Acoustics SB29RDCN-C000 (no waveguide.. for reference)