Look, i had the DT1990 Pro as comparison, if i had to choose between them due to hardware capabilities, they DT1990 Pros would win. the P9 have ok separation but not worth the $1,000.Oh come on man..you didn't find the instrument separation very good? It's astonishingly good. Almost too good to believe.
But, if you enjoy bass, then they are good bass cans. i can't deny that.