2W will get a pair of Aeon Noire's to 125dB. That's the entry level into a range that contains jet engines and fireworks.I just stop questioning when people say their headphones need 1W. They obviously listen at very high volume levels. As I have gotten older (I turned 50 early this year, which granted isn’t really THAT old), I have found that I need to turn the volume up too, but never to the levels these folks are talking about.
Listening at that level will get someone permanent hearing damage very quickly. An extra watt gets us to about 127dB.
125dB is often considered the threshold for pain.