Small dynamic drivers in open cups. Grados just start puking everywhere, not just in the bass, when pushed hard.
But I'd like to see PM-1 THD figures zoomed in 0.001% to 10% on a log scale at 87dbA. That would a very meaningful measurement / visualization which could, but not necessarily explain some of the things which I did not like about them.
Edited by purrin - 4/15/14 at 6:38pm