These headphones have great sound and outstanding passive noise reduction.

These are the ideal headphones for cubicles for those who don't like active noise reduction, just don't get them here.

They still maintain the exceptional noise reduction of external sounds, and are more comfortable than the 280s

about the passive noise reduction.

My purchase motivation was improved sound quality and reduction of external sound.

the 32db of passive noise reduction is very clear, I can hardly hear anyone speak when I have these on, even with nothing playing!

These sound great and in a live sound environment the passive noise reduction is priceless.

These headphones have great sound reduction

Nothing permanent as far as I know, they fluctuate and such, but my ears do have some blockage and volume reduction issues going on

Sennheiser boasts 32db passive noise reduction

All in all this cans are very sturdy - AND VERY LIGHT - and this again compare to any of the cans i mentioned above - again if it would not be for strong clamping power i would keep them as spare headphones for my Shure 1540 - also Senheiser HD 380 Pro is good as portable - i like the cord and that this cans can be folded and very nice travel case