I just re-read some comments from above. What is the consensus with the M60's?

Do I set them as "Small" and make my cross-over at 80Hz and just leave it? I'm looking for a one time fix (not a tinkerer).

Also, it was mentioned that mid-range frequencies are much higher than 80Hz. Just to give me an idea, how low is 80Hz? Any examples from movies or music that might help me understand how low or high a frequency is?

(E.g. where in the spectrum to normal voices fall? How about high hat cymbals, and what about bass notes on a piano - Or explosions in movies?)