I have a B&K 307 AVR with lots of choices for crossover and low pass and high pass ramps. The B&K manual list "THX" settings of crossover at 80, with high pass set at 12 db and low set at 24 db. My Divas are 6.1 mains and C3 center (4.1 sides and 2.1 rears). So, I'm looking for suggestions for the crossover point and are the ramp rates for high and low ok at 12 and 24? The SVS's will be driven by the Samson 1000w amp and I'm getting the ART 351 to keep things as flat as possible. I'll do lots of tweaking when my new subs arrive, but would like any advice I can get in advance.