basically, you can only have a 3" voice coil, pretty much any coil config from quad .7ohm to single 4ohm.
spiders are for the application, the softer the more efficient and less power, harder is more geared toward SPL. the SE has dual soft spiders i believe, and the MT has quad stiff (you can get them made to spec, but thats a common config)
at least thats my understanding.
so yes, re can recone it. and many other places who use 3inch coils could too. think digital designs, incriminator, ect. i think soundsplinter only uses 2.5's.
email and ask different companies!