Did you mean "set the processor's input to stereo (no surround processing or analog bypass)"? You said "SMS-1" but not sure it can be set to anything but mono. And yep, I turn off the xover in the SMS-1.....I'll experiment and let you know. My Denon 4806 has separate crossover levels for all speakers, including the lfe channel. I'll set the mains as high as possible and match the lfe crossover the same.
Thx
Ted