Wow! they are good! Are you amping em off of a headphone amp or something? I am planning on building a vaccum tube headphone amp having hard time getting my hands on the tubes but it's worth the pain the OP characteristics of vacs beat transistors by miles! I've literally heard the difference! I am saving up to rebuild my RX100 and if I save up enough Ima get myself a pair of Grado SR60i :d I know there are SR80i's as well but the only difference between 60is and 80is is that 80is have a bit oomph to the bass and the soundstage, I listen to electronic music anyways so I guess 60is would do good