I just got my much-anticipated HD 25-1 II's and I'm rather disappointed. The bass is smooth and powerful, but they are so dark-sounding that I can't believe they are so highly regarded among headphone aficionados. The highs are recessed and distant, and can only be brought forward by equalization. That's not a problem when I'm listening on a computer, but my portable DAP player lacks any kind of tone controls and the sound using the Sennheisers is disappointing.
I've read on some of the forums that the sound quality of some headphones, including these, changes on burn-in. Is that true? By what mechanism does that occur? Is the sound of my Sennheisers likely to improve, or am I going to have to send them back? Thanks for any help you can offer.







