You may not have to tame anything. One of the characteristics of ganging multiple speakers together is that the the FR's tend to smooth down to a common flatness.I electronically crossed my system (http://pub48.bravenet.com/photocenter/album.php?img=115732&usernum=4095425731)
and purchased a 2/3 octave crossover to tame certain aspects. I took it out of the circuit since its just not needed.
Marlboro