I have a pair of these and they have served me well through B+Ws, Wilson and now Revel speakers. The very flexible external x-over can dial in your bass needs to match room and speakers. But, it may take weeks of trial and error for you to achieve a seamless blend. I've done the tower "dance" too often to number.
The SW800 were designed to give the Martin Logan CLS an extra octave of lower frequencies, so they had to perform without destroying the delicate nature of the panel speaker.These were made for music, not home theater.The cone excursion is less than an inch, and even though there are 5 ten inch drivers a side, they may shake, rattle and blow with your typical DVD. This can mostly be alleviated with corner placement (there goes the music) and at least 300 watts a channel.
For best results:
1) get stands, the supplied cones are worthless
2) lots of power
3) run your main speakers without going through the x-over. The x-
over hardens the sound.
4) 60 or 80htz is as high up as you want your subs to go
5) down position the low pass filter toggle switch to the 18/octave
"Butterworth" filter. This works best with large speakers.
6) don't skimp on cables
This is what works for me. My room is 20x30ft, so the Kinergetics have their work cut out for them. In their 10 years of service, there hasn't been one problem (no Nudell foam rot). Their height alone makes for an incredible soundstage. I don't know your room or system, but these few suggestions should be helpful.
Congrats on your purchase!