Ok, I give up... my mains are definently putting out sound down to 20hz up to full strength db level by the time it hits 40hz when set to small. When set to large they start at 15hz to full db strength by the time it hits 30hz. I've set the crossover anywhere from 40hz all the way up to 200 hz in 10hz increments on the receiver to no avail! When I set it to 40 hz I can hear fluttering in the tweets. I've tried all of my dsp modes, pure direct mode, 2 channel mode, straight mode, nothing seems to make a difference, it is not cutting off the low frequencies anywhere near the 80hz like I would like it to. I emailed yamaha last friday but have yet to hear back. Kinda hard to blend in the sub when I have 2 mains that are acting like one.