As a proud new owner (2 weeks after 1 1/2 years of research) I've found that the best way to listen to Rock albums on the M3s is to turn them to small and set the crossover at 60Hz or higher. I use them without a subwoofer and the albums still sound fine. The M3s do not have a low pass filter (at least from what I've read and observed) and will try to reproduce the entire low end frequency spectrum, which is wonderful for acoustic performances but not that great for hard rock; especially poorly recorded rock albums.
The major benefit of taking M3s over M2s is the ability to have deeper bass extension, so if it sounds too boomy on hard rock albums maybe you should go to the M22 or the M2 and pair it with a subwoofer.
