thanks for the great responses from everyone, just cant beat the headfi community for their willingness to talk about every aspect of headphone related topics. I am getting a good seal on them they fit just fine, and i have been using them from the fiio e7 / little dot mkiii / audiogd12
to test the bass and pretty much same response from all three amps. It would seem from all your posts that i may indeed be trying to hear the mid bass hump that the m50 exhibits. The d2000's do reproduce bass but generally only when it goes very very low, like has been mentioned previously, i just feel the 50's did a better job of bringing out different bass notes throughout the bass spectrum. I would like the d2000's to "kick" a little more but it generally only replicates serious bass on a serious bass song (one that goes very low) so yes these do have bass and i intend on keeping them but i can see i still am looking for a bass more to my liking. I have read in another thread in the forums someone having a similar experiance to mine, bass is very subjective and we all have different ideas on exactly how it should sound. This is why it seems to be a recurring topic here on headfi, hotly debated too because bass is sometimes given a bad and not appreciated as much in audiohphile terms as 'mids' or 'highs'.
so anyhow in conclusion im very interested in these Beyerdynamic dt770 pro 80ohms
who would like to elaborate more on them?