One thing to keep in mind, though, is that M80s handling very large amounts of power are running "flat"... just boosting the bass by, say 3dB will push the woofers twice as hard.

For best performance with huge gobs of power, I would certainly be rolling off the lows below 40Hz or so and let a sub handle the LFE stuff.

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::