I love my Sony 7509's..(and I rarely ever buy anything made by Sony) They're like having a subwoofer attached to my ears. They need power though. Sound weak with the ipod, but to my receiver, amazing. Just have to eq the treble up just a notch. The bass is so good, and these go so incredibly loud without any sign of distortion, that you can seriously hurt your ears if you are not careful. Your eardrums will blow before any bass distorts. I don't think a human being is capable of hearing these distort. . Grados were far too high in the treble, weak on the bass. No amount of EQ helped. The Sonys can be EQ'd to sound exactly like you want, as much bass or teble as you like..no limitations. The Senns I tried were close, but these rock.