I have had these 58x for a year and there was something about them that was bugging me and after putting on my old HD 477 . It struck me there's a bass issue with these phones.. So what do I do .. I got the EQ cranked with the bass and it seems lacking.. It was driving me crazy. But the HD 477 as crappy as they now are they opened my mind up to why the issue was. BASS . There's no bass in these 58x or it lacks something but what ??????????