Summary: No power handling spec was VERY annoying- I knew it needed more power than a reciever jack or discman. I got a headphone amp of something like 1wRMS. After hearing this headphone had the best bass I put on my BASS MECHANIC cd. This annihilated my sony V-600 and their voice coil fried. I think it's 4cm driver split into like ten burned up pieces- well so much for those 5HZ headphones blowing on a 35Hz test.