Disclaimer: Yet again, this is Danganronpa's fourth pair. Now I only have two more to go..!
Along the history of headphones, AKG have continously made many technological innovations, such as K340, the ultimate electrostatic-dynamic hybrid, and K1000, which is driven like a pair of loudspeakers. AKG's reference headphones surely have a great heritage to carry on!
CON: The response above 5 kHz may completely be equalized depending on how the headphone is placed on the pinna. The effect is even greater than that of Sennheiser HD650, which is already well known for its high amplitude deviation in the treble.