I am not arguing, Amir, you are a nice guy...as learnt from our private communication.
But if I look at the whole body of evidence since 2003 (HD 650 release), a lot of people must have been wrong...and wrong exactly the same way...which is very difficult to achieve. Anyway, if you are right, then I rightly did not order the HD6XX (drop version of HD 650), considering I already have the HD 600. Saved me money
!
But one thing I can say: I tested the HD 600 with different pads, two really fancy pairs from Dekoni and one from Yaxi...and they altered the sound completely...and not to the better, sadly.