I have, because I know the Koss brand since the 70s as a top company, gained the aforementioned studio headphones. The sound of my high-end system leaves no wish unfulfilled. Whether classical or rock and pop pieces selected the sound is not to beat in my opinion. Granted, the headset is a bit heavier as most other due to its quality materials. I am bothered that 100 gr extra weight at all. As already mentioned the quality of the phones is obviously professionally. What also makes me positively, is that it is a 6.3 mm in the latch which is designed just for hi-fi systems and not for Walkman and Co.
Facit: I am from Koss Pro 4AA excited and hope that it is just as durable as his model colleague from the 70s.
