Wouldnt crossings over a 15in woofer at such high frequency cause an unnatural sounding spike in SPL above say, 120Hz? Given the assumption you plan on driving this woofer down to say ~20Hz. My thought process is the power required to create the desired SPL and to accurately drive that woofer down in the 20-35Hz range would be excessive over 200Hz.....\nYup, that's definitely getting into the nitty gritty of speaker design. ;) While that certainly could happen, the job of the speaker designer is to make sure it doesn't. Box size\/tuning, driver parameters and crossover design all need to work together properly. Some pull it off better than others.... In this case I think the guys who designed this speaker did a pretty good job based upon the measurements I've seen. They use a custom pro audio driver that's very sensitive so they don't need much power and can be tuned flat pretty easily. Even these though, won't hit 20 Hz, so I'll still use subs with them. But they'll certainly allow the subs to do what they do best, the midrange to do what it does best without having a hole in capability in between.