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I've been using Beyerdynamic DT250 80ohm version. It is designed for filmsound and isolation of outside ambience is pretty good. Something about 12dB if I remember right. But ofcourse these leak some sound also but after you have used these and they have modified to your head they do isolate more than most closed does. They do look quite old and big but not that old and big when turning eye on AKG or other used. I dont like Sennheiser since quite small earcup and it makes my ear hurt after long session. Beyer isnt big either since it is oval earcup and so it does fit in ear but still isnt that large (vs. AKG KF240M). These Beyers do work with most gear out there. Even with cheap/small portable units where headphone amp is often very poor. There is also 250ohm version of these but those need more power from headphone amp. I like the frequency response what Beyer gives. It is almost flat from 20 to 20k. specially lowend is very flat and many bassplayers do like these very much since these are accurate at this frequency. There is a little gain at highmid to make humanspeech little more detailed and it is just fine for me since I use these also for filmsound and there is important to get all information about human speech without losing trouple makers like ambience which usually is lowerend material. I did do some research before turning into these headphones. These does cost less that Sennheiser 25's which is very good for portable use also. They do sell Beyers earcup peaces for Senn and Sony also and I understand that since these are best. very comfortable and after 10h lesson still dont need to get em off my head. luck, .jukka rihmasto.