I like the bass of the RS 180 with the bass boost on with my cheapo Fiio E5 than without, even tough the bass a bit much, bloated and muddy. If HD 598 is anything like RS180 then I am OK with a slight bass boost from a good amp, portable or not. Maybe I should consider something like cMoyBB v2.03 rather then Fiio E12? I was also thinking about getting Beyer-dynamics DT 990 pro but review seems to indicate the DT 990 to be bright and I hate bright and forward sound. Or maybe something Yamaha HPH-200. I need a headphone well suited for movie watching which mainly intend to use these cans for. I have a few good IEMs I use for music, Sennheiser IE8, Ultimate Ears Triple Fi 10 stock and custom fitted, Fischer Audio's DBA-02 and a few others so I am covered in the music department. I need good phone for movie watching now.