I just got a set of Beyerdynamics DT770 Pro closed back circumaural headphones and now I’m listening like mad to familiar music in order to get used to them as quickly as possible. I wanted some better quality closed back headphones firstly for performing, but secondly for recording, producing, and listening while on the road.
So far I’m very impressed with the detail and bass response. They have much more bass and overall volume than the AKG K240s that I use in the studio, but I imagine that the open back K240s are probably more flat. The DT770s are a snug fit and surround even my abnormally large pinnae. The thick velour padding blocks a fair amount of sound and keeps your ears toasty warm, or nice and sweaty in this ninety six degree heat.
It took me a while to decide about these phones, but based on what I’ll be using them for I think I made the right decision. They are louder than I expected, given that many people prefer to use a headphone amplifier with them. I didn’t find amplification necessary with my MacBook Pro, but haven’t tried them with an iPod, or anything else yet. Feel free to chime in with your own experience or opinions on headphones.