Hi, new to forum, just set up my HT with 340 SE across the front (on stands) with 170 surrounds. Budget system so I am using a Klipsch powered sub that I already had. System performance on the bottom end is pretty wildly variable from boomy to weak depending upon source material. Should I set the crossover lower for the Ascends and attempt to get more low end out of them rather than rely upon the sub - or will I end up with both trying to supply frequency from 60 and below?