a) Set all to small
b) Set receiver to 80 Hz, sub x-over doesn't matter using LFE input since it's bypassed.
c) Yes, if speakers are set to small. The x-over point only affects the speakers set to small. If set to large, the speakers receive the full frequency spectrum.
Mitsubishi LaserVue L75-A91, Denon AVR-4810CI, Oppo BDP-83, Escient FireBall MX-111, APC H15
Speakers: L/R - ESS AMT Monitor, Def Tech ProCenter C2, UIW BP In-wall, UIW 64 In-ceiling, Dual SVS PB12-PLUS, Def Tech SuperCube I
Zone 2 (3 Areas through Niles HUB8, Niles MSU-480, Niles TS-110 Table Top Sensor & 3 x Niles IM/VC w/IR sensor)
Paradigm CS60R In-ceiling 2 Pair
Exterior -- Backyard Patio
Paradigm Stylus 250