Have the electrician trade many headphones tested and decided because of the sound quality for the AKG K 619. After a relatively short time then the aural excitement was over. The swivel joint, which allows the folding of the ears was broken and could no longer be repaired. Because I thought I had been rude to the headphones, I bought a second because of good sound quality. Same dilemma again. Now I have two defective headphones, lying around with the "broken leg". Obviously, AKG has not recognized this weakness and also not resolved. Can therefore of a purchase only advise.