I have the SVS 25-31PCi and have unsuccessfully experimented with sony x-over from 70-100hrz and really heard no differance. I have all set to 90Hz My mains are set to small, LFE cutofff at its highest, and no use of eq with HT. Should I try to go lower (mains spec'd to 35HZ per Mirage FRx-7 manual) like 60. Some other questions; 1 What should I set my adjustable LFE cutoff freq(40-120)? Standard ids 120. 2 Is it a fair guess to set individual speaker x-over freq (L,R,C,RS) about 20Hz over the speakers lowest frequency response? Sub calibrated at 87db with Avia at 0 LFEpad and -5 sub output (on receiver). I appreciate all responses!