Revel B 15 sub,crossover question

Hi, I am looking into adding either a pair of Revel B 15's or sub 30's to my system,but I would like to know if anybody has any feedback about the hi pass crossover does it do a good job,meaning do the main speakers still image well no loss of mids or highs,and were you happy with the hi pass on either of the subs.

Thanks Mike.