And over 200w at 1 ohm. Context is everything and the 15w figure quoted here is attached to a quoted 133db output. Which is great if you need headphone-shaped speakers for your room. Let's be serious, you can attach whatever amp you want to these headphones and use maybe a couple of percent of its capacity. That's fine if overkill is your thing. What I've seen in this thread, and elsewhere on this forum, is the derision of everything other than overkill, to the extent where purchasing decisions are influenced by such foolishness because people are told that overkill and a guaranteed 120db+ output is the only way to go. That anything else doesn't allow for the full realization of some mystical potential.
Please forgive this furtherance of the ampy digression.