Thanks. I sent email to HSU asking about crossover and response was, "I would suggest setting the crossover to 80 Hz for all speakers. That would increase the dynamic range of the whole system. The Onkyo has limited power and by keeping bass out of the main speakers, more power is available for the rest of the frequencies." Now this sort of makes sense I guess but with the AS-F1's up front what benefit is there in having them if one sets crossover at 80, the same as the B1's? I thought one pro of having towers is to set crossover lower for them for fuller sound from front?