jayboard, if this worked, it'd be purely coincidental - what if your room resonance was @ 120hz? i don't tink ewe wood wanna raise the monitors' x-over point to, say, 140hz, and the subs' to 100hz, yust to deal w/this, if better integration between sub-monitor were, say - 60hz. ideally, ewe set the x-over point as low as possible... there are good (& expensive) room-equalizers awailable that are designed to tame room-dependent frequency abberations...
one feature that my marchand x-over has, that makes it easier to integrate my subs w/my monitors is a separate wolume control *at* the x-over point, as well as wolume controls for the subs & the monitors. i have it set at -2db, which works best, w/my speakers, in my room. this was verified w/a pink-noise generator & spectrum analyzer.
regards, doug s.