Headphone with noise cancelling

Design, comfort and appearance

As soon as you open the box  of the best noise cancelling headphones, you immediately understand that the contents of the exclusive class. All materials are finishes of only the highest quality. With a better view, you can see not quite high quality nodes of elements. This applies to the attachment points of the plug holding the headphones cup. Usually at headphones of such class butt knots are executed from metal, and here they are made of plastic. This is unreliable. The fact is that in the KOSS QZ900 cups multiple nodes and sound control schemes are hidden, besides, they hide three AAA-type elements, and all of this together creates a pretty decent weight, which is difficult to compensate with plastic pins.

To the materials of the cups there are no complaints – the back side is made of soft plastic, which is pleasant to the touch. Everything is done in a combination of two colors – black and silver (although, in fact, instead of silver plastic for 7500 rubles, I would like to see real metal inserts, not imitation). The earrings are made of genuine fine leather with perforations and a ventilation system. The foam-helium filler of the ear-cups ideally plays the role of the headband pressure compensator, as well as the noise-isolating device. It should be said that the soundproofing KOSS QZ900 consists of two components – passive and active. Passive – a set of systems that prevent the penetration of external sounds under the cups of headphones. And an active noise reduction system is a special device, which causes the membrane to oscillate in antiphase to the sound vibrations that penetrated inside the noise cancelling headphones. The very membrane of the radiator is covered by a microfiber, which absorbs noise in the range up to 100Hz, caused by oscillations of currents excited in the induction coil, thereby making the sound stream cleaner and more qualitative.


The headband consists of two parts – a dense steel plate, around which is formed a belt of sealant and genuine leather. All this is done very qualitatively and soundly. The regulator lever goes into the headband and is not visible from the outside. Fixation occurs at the click, which is not very convenient, especially if the user has a non-standard head size. Comfort from wearing KOSS QZ900 does not cause any complaints. You can wear these headphones for many hours in a row and not feel any unnecessary pressure, no fatigue of the auricles, or thermal discomfort. Everything is done so that the user listens to music, and not distracted by extraneous sounds.

Quality of sound, features, nuances

In the cups of the KOSS QZ900 headphones there is a whole complex of software and additional sound control devices, in addition, the sound source itself is a 45 mm radiator connected to an induction coil with a neodymium core. The core recall speed is 0.00001 seconds, which makes it possible to almost instantly rearrange the picture of the sound line in accordance with the information coming from the audio system.

The downside of the KOSS QZ900 is that its impedance is 40 Ohm, which means that a regular MP3 player simply does not provide the required input power, and as experts say, it does not pump out the coil for high-quality playback. Ideally, the KOSS QZ900 starts to sound if the signal comes from devices with an output power of 100mW (smartphones, tablets, stationary computers, audio systems, home theaters, etc.). The sound of the KOSS QZ900 is just perfect on the entire playback range from the bottom to the top notes.

Even if you listen to a piece of music performed by a symphony orchestra, you can hear each instrument, feel its part and location on the stage. In a word, the electronic filling of the KOSS QZ900 and the system of sound emitters work almost perfectly. However, if you need the KOSS QZ900 to be focused on the sound of bass, then you just need to work on EQ.


Indeed, KOSS QZ900 – almost perfect headphones. They will be appreciated by music lovers, as well as by those who only discover the world of music. Any other model could count the price of 7500 rubles unnecessarily high, but as for the combination of all the qualities of the KOSS QZ900, noise cancelling headphones with similar characteristics are much more expensive.

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