What you are talking about is localization, where the sound becomes easily localizable to human hearing. Localization does not really occur below 80 Hz, which is where most people cross the subwoofers over.
A 10" CW probably has a good amount of punch above 80 Hz, but it will not challenge a decent subwoofer at all below that point. If you are really worried about localization, just get two subs and place them close to each speaker. Two of
these bad boys will annihilate the Klipsch or CW speakers in that frequency range, and you can raise the crossover to higher frequencies without worrying about localization if they are placed close to each speaker.