I can see that if the M80's roll off at 30hz and the sub will start to take over ( so to speak ) around 80hz and keep to volumn level going to say 25hz when it starts to roll itself off. OK, I guess I answered the question in the question and calibrated right, would be awesome. But, then if I have a good sub like that why the 80's whynot get a speaker like the 60's where that much bass in a front is not needed that much specially if the LFE is set to 80hz.
If your receiver allows separate crossovers for each channel there’s no reason you have to set the crossover at 80Hz. I have the crossover on my L/C/R M80s set to 40Hz though I seldom find the need to use the sub for music.
