The AKG K270s are the classic, big huge studio headphones.  There is little doubt if you see someone in these cans, they're tracking tasty licks on a new album.  Despite their size, they do tend to push in the mid-range frequency.  This might be by design in order to push them as vocal tracking headphones but if you just want to listen to music this is a minus.  On the plus side, these are 75 Ohms making driving them from even an iPod or portable music source no problem - something you will not do with the better sounding K240s.  These are sealed and...