His requirements are:
a) closed cans
b) no amp = low impedence <100ohms
c) high resolution, good bass
There are only a few that qualify. Good ones would be the Beyer DT 770 (32ohm), Audio Technica ATH-A900 (32 ohm) and AKG K271 Studio (55ohm).
Each can has its own distinctive sonic signature, so its best that he try each out before deciding.
a) closed cans
b) no amp = low impedence <100ohms
c) high resolution, good bass
There are only a few that qualify. Good ones would be the Beyer DT 770 (32ohm), Audio Technica ATH-A900 (32 ohm) and AKG K271 Studio (55ohm).
Each can has its own distinctive sonic signature, so its best that he try each out before deciding.