I finally completed a bass cabinet using ported cabinet and a
15" JBL M151 driver. This is essentially a 4-Pi without a horn.
Sounds great to me. 4K-5K is stretching it for many of the
Eminence drivers, except for the B102's. Those are 10" bass
speakers that have decent specs. you'd have to model them to
see if they met your needs. Each is good for 200W. I'd go for
a pair. Have you checked the eminence site for specs?
http://www.eminence.com/
Chris