Hi all. Currently have an ep125 and am going to upgrade to an EP 500. What I am trying to figure out, (and want to try) is if their is a way I can use both subwoofers. More specifically, Use the ep125 for upper base 90-120, then use the ep 500 for the bottom end. HSU resesrch has been doing something similiar and now sells an upper bass sub, crossed over from to cover from 90-129. Can anyone think of how i can cross my ep 125 over similiarly?