The ads are clearly on the latest advances in the headphones. Noise reduction is often clearly visible, because the whole purpose of the presented wireless headset is to reduce the ambient noise and get a pure sound

However, the problem is that many of the headphones, noise reduction or not, change the sound electronically. Most of the units function quite well in the lower end of the frequency range. With other words, the sound of traffic or buzz of an airplane engine significantly reduced. TheMid-Range, has, on the other hand, are clearly not sufficiently reduced when compared with the bass, and at the upper end, it is almost negligible.