Duke with the posters question in your opinion would you still play full range on the main speakers or cutoff the lows and direct them to the subs;I would think this would be the correct choice but I thought I would see what you thought.
Speakers to alleviate room anomolies
I have a suckout of 8db from 58 -70 hertz which is taking the life out of the music. I currently have Von Schweikert VR7SE an added a velodyne dd18 which took away the problem. It gave the bass energy in my room of 30 x20x10. It seems I do not need the big cabinet speakers[VR7SE] if the woofers aren't throughing enough. Speakers with active woofers like the evolution acoustics mm2 have been recommended. Any other ideas of speakers in conjunction with the velodyne dd18 to make my room sing again.