This helmet is simply a bomb. Parrot Zik and other Beats beings can put in the trash. These brands do not have the experience of Beyer in the world of headphones unfortunately can not compete with it. These brands are all targeting the low and nothing in the rest of the audio spectrum. We meet with headphones that make boom boom, and nothing in the midrange and treble. Furthermore on a much higher price range that our Beyer Custom One Pro, which is both in the low and see far better thanks to a mechanical trick called "Custom Sound Slider" that offers a variable aperture system bass reflex headphones on the hull. This will vary the sound of the helmet on four different levels of bass. And it's great bluffing is reliable since no electronics, and if we want the bass he has what it takes with a much higher quality than the helmets mentioned above. There is sufficient test on the net to realize. And what does no harm, it is that the rest of the spectrum, mids and highs are present and all in finesse. One can engage in all types of music, from classical to rap. Everything is on the helmet is inter-changeable and therefore can change it at leisure the look. In short, after a ET 1000 which was in its time the best headphones in the world and a DT 770 Pro (250 ohm) that defray all chronic here Custom One Pro in another register which defrays equally chronic. I'm not that Beyer has also since I Koss (Porta Pro), Audio Thecnica (ATH-A900X), Philips (SBC HP890) and Sennheiser (HD 650). The Custom One Pro is a must-have.