I use a Velodyne SMS -1 (between pre & power amp) with great success. The unit has room analysis and PEq along with a very flexible low pass x-over and a basic high pass x-over (fixed @80hz, 12db/octave). If you need a different high pass set-up for your mains, you can afford a good one because the SMS is available on-line for $600.
Good Luck
Marty