I don't think you'll hear the M80s physically bottom out either. What happens is as you push into higher volume levels is you reach the soft limits of the woofers excursion and you get a compression-like effect, dynamics diminish, but no physical stoppage until you push much harder.

On the other hand, squaring off the tops of the waveform causes a very harsh sound.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris