My current setup is- 2 EV Gladiator G115 tops, 2 SB180 18" "subscoop" bottoms. Top driven by AB Int'l 600LX amp, bottom driven by Crown Mactro-Tech 5000vz. I have a Ashly XR2001 4 channel 2 way or stereo 3 way crossover.
Here was my thinking- the EV subs have a substatial amount of output rising from 80 Hz to about 150 hz then it levels back down, most likely from the reverse scoop design which hornloads the upper frquencies. Its also got EV's best woofer, the EVX180B driver in there.
(for the freq response chart, please see: sorry I dont know how to paste the PDF onto here for easy viewing.
http://www.telex.com/Electrovoice/EVFiles.nsf/0/18aca2c5cc2d a0d48625693b00587781/$FILE/sb180-eds.pdf )
I'm thinking if I built the 2 Labhorns, I was planning to just use the G115's on the top although they wont be loud enough to keep up with 2 Labs with a 5000vz on the pair. So...I plan to use the SB180's to play from approx 80-250 hz. They should be able to get extremely loud in that region, then it would free up the tops so I could push even more power into the highs.
Another thing is i play alot of dance music, so that reverse scooped 18" woofer pushing 80-200 should be able to move a significant amount of air in the "punch" region. I'd have to buy another amp and possibly some time delays too.
Another thing, is that the EV SB180's are about the same dimensions width wise as a labhorn, and about 1/2 of one high, so I could easily stack the SB180 ontop of the labhorn and then the tops above that if the application called for it. Any thoughts?