Got these as a upgrade when my ER4PT cable broke. Never expected these blow me away despite being DF flat and BA based, But after owning them for 2.5 years. I keep getting surprised at how detailed they are when trying past albums in my collection, many sound like if I was given a remastered version. Never understood the "Single BA" claim since the bass goes super deep and the super fast decay really helps with keeping up with fast metal/electronic. While any dynamic headphone seems hit a wall and the bass just sound like a muddy mess. With EQ done...