Stereo Headphones Sennheiser HD 448

An excellent helmet, obviously. Very well balanced, it does not add too much bass harmful. A one and only complaint, which put me (reluctantly) on April 1 of 5: impedance 32 which is also its quality does not (in my opinion) to use on my iphone, I intended to use mostly do, and that plan by the manufacturer logos iphone and ipod on the box. Indeed even at the bottom, the sound is not strong enough and powerful, by far. By cons, (so it's really headset "Stereo" and not mobile), plug it into a powerful type computer system, sound or stereo card, even without much up the volume that is guaranteed to be literally transported ...