I posted some images of my recent waveguide construction on the "Horn system pictures" thread, <http://www.audioheritage.org/vbulletin/showpost.php?p=122818&postcount=49>, and in post #51 "Titanium Dome" followed my post with a request for the & measurements I made on my waveguides.
Rather than clutter up the "Horn system pictures" thread, I have chosen to start a new thread under the DIY section, with more details of the design and images.
The two new waveguides are mounted on a pair of 1" exit TAD 2002 compression driver, and a 2" (49mm actually) exit a pair of JBL 2441 compression driver.
I purchased the TAD new, however the JBL 2441 originally saw duty as part of the sound reinforcement system of the Calgary Saddle dome, home of the 1988 Olympic games <http://www.pengrowthsaddledome.com/foundmain.html>. It may be unusual to use a device which once shared about 1/15 of the coverage duty for a 20,000 seat stadium in my modest sitting lounge, but it should be no surprise to this membership that achieving realistic dynamic range with low distortion does require some extreme measures to achieve our acoustic goals
The full list transducers in the speaker system consist of (refer to picture 4 in this post)
2 x TAD 2002 (4khz - 20khz)
2 x TAD 2441 (1khz-4khz)
4 x JBL 2123 10" cone midrange (250hz - 1khz)
4 x JBL 1401nd 14" cone upper bass (60hz - 250hz)
2 x Altec 3182 18" cone sub bass (7hz-60hz)
The waveguides were designed using information from published papers by Earl Geddes. (reprints can be found at: <http://baseportal.de/cgi-bin/baseportal.pl?htx=/Data/exdreamaudio/download> )

Images and measurments graphs to follow:

Jack Bouska