As I include a lot of classical in my listening, and it has far more dynamic range than rock does, I am more concerned with whether a speaker sounds realistic at quite low volumes - many do not and require a fair bit of 'knob' before they start to sound good.
Unless you can hear the 'ting' of a triangle in a quiet section as realistically as the cannon on the 1812 (or the range in much of Stravinsky, Beethoven etc.) a speaker is basically useless as an all-rounder.