I had less expensive B&W P6s. Even these had very good "punch" with a high power amp at loud volumes but were lacking at lower volumes. This was due ti the difficult load/high current issue mainly I believe. The amp delivered 360w/channel but not a lot of current. At low volumes, the bottom end suffered. At high volume, they rocked.
Even with metal, you do not want to always have to crank things to sound good. Match amp and speaks well and thnigs should sound good at lower levels also, although metal will still always sound best CRANKED!!!
Even with metal, you do not want to always have to crank things to sound good. Match amp and speaks well and thnigs should sound good at lower levels also, although metal will still always sound best CRANKED!!!