which excels at Rock and Roll

Honestly,  big B&W and MacIntosh amp is the formula for Rock and Roll. Most of these other speakers are intended for delicate reproduction of nuances, like subtile violins. A Big Mac and B&W will kick ass with rock and roll. The Mac is heavy on midrange and bass and the B&W can handle it. 

Dynaudio is the speaker to beat for aggressive Rock n Roll music, they excel in this area, the more power you have (in solid state form) the better too. I drive a pair of 25 year old Contour 3.0 Dynaudios and I use 2 stereo amps in mono for 700 watts per side, the Contours are rated at 200 watts, the extra power really makes these speakers shine with incredible detail and pace, timing, sound stage. Sure I could drive them with a nice 200 watt per side amplifier but then I would have nice music instead of Instruments in my listening room! 

Matt M

@robshaw Speakers and electronics don't care what music you like or don't and don't favor a certain genre. That is one of the most common an persistent myths in audio. 

It really is a myth. No-one has found a way to design either amp or speaker to favor a certain musical genre. They are equally good or bad at their jobs regardless of the genre. 

Ralph Karsten (atmasphere) always makes his above argument. And while in theory it may be correct, in practice it is not. Just one example: If you want to play AC/DC or The Ramones at 100dB, the QUAD ESL is a bad choice; a pair of them is not going to last very long if you do.

"Speakers and electronics don't care what music you like or don't and don't favor a certain genre. That is one of the most common an persistent myths in audio. "

I can't argue with that statement. It's obviously correct. However, even though the speakers and electronics don't care, the person listening to the system most likely does.