Been listening all morning and with Keg's amps, which remarkbly set the levels between woofers and tweeters perfectly, it's sounding very good.
Stephen, I'll order some lpads to get the response evened out for a single amplifier and have you out again soon.
http://diyaudioprojects.com/Speakers/Tang-Band-D4-1-DIY-Horn-Speaker-Kit/
I will be bringing these to Dave's house - I know people are interested in hearing them.