Commenting on your previous questions: 1. Yes, if for some reason the speaker-level connections were used, the sub crossover would have to be used, not bypassed, because the speaker terminal outputs from the receiver send out a full-range signal, rather than one limited to below 80hz which would be sent out by the receiver sub out; 2. That's about right; the sub crossover doesn't take any of the low bass off the mains, and that's one of the problems. It's better if the receiver amplifier and the speakers are relieved of part of the bass burden by introducing the bass crossover in the receiver.
