Update: I was really optimistic about the SRH-1540, being the high-quality headphone that it basically is. But the treble rolloff has become unbearable after a few days. Going back and comparing to the B&O H6, B&W P7, Beyer COP and others, all of the others have the treble extension which is recessed on the SRH-1540. So I enabled the old reliable iTunes Treble Booster, which brings the SRH-1540 treble up to a comparable level (with no noticeable peaks or roughness), I gave it a long listen comparing back and forth among these headphones, and am satisfied that the result sound is OK for the $500 USD I spent for the SRH-1540. The problem with the SRH-1540 seems to be the design - a much stronger than neutral bass, a more distant than normal midrange perspective, and a slightly reduced treble - all combining to render the highs much weaker than the other headphones.