What I was thinking was to use the 8 - 4"x6" speakers as a direct radiating line array and use the back wave of the speakers to feed a rear loaded horn to help with the lower frequency response. I haven't been able to find any information on a combination mid-low frequency line array, rear folded horn.
Marlboro, is this what you meant when you said it would be coloration lunacy?
I am not looking for a horn woofer array. I am toying with the idea of a dual 8" loaded Bill Fitzmaurice Table Tuba, if I need it.