Hello All: So I hear that headphones need some burn in time, and after this period the sound will settle/improve. Many people claim their headphones improve in quality after burning them in and they DO believe in it. I asked someone at Sennheiser about burn in time and this is what I got: Hello, We do not have any specs on a "burn in" time. These sets do not require one, and will be fine to play at any volume out of the box. Let me know if you have any other questions. Thanks. Regards, Scott Houston Technical Applications 860-434-9190 EXT. 182 email@example.com Sennheiser~ Neumann~ Turbosound~HHB~K+H Anyone care to sort this out for me please?