The W22's I would imagine worst case scenario in a bad room or whatever would be able to handle 110 hz or so, so any sub that is level up to 120 would match nicely. Usually the smaller 10" ones are better for that range but don't go real low down to 20 hz and below like some larger subs, but they are best for movies anyway. Something like the EP350 or even EP500 seems to be a good compromise, maybe the 400 (or even 175) for music and 600/800 for movies and their house shattering ability.
For my setup Audyssey set my W22's crossover at 80 hz, but I have bumped them up to 100 hz to be safe.
