At one time I wrote a detailed review of the QC15. I decided to leave a review about this model, in a year, perhaps, I will write a more complete one. So, the sound has definitely improved. In my opinion, there is an improvement in all frequencies. The cover is much better. Now there is a special compartment for the battery, and the case itself has become more practical. Headphones now fold, that's what was missing. They work without the included noise reduction, however, there is little use in this, because the sound is terrible, the mode is exclusively forced. Noise reduction has become noticeably better, wind and high frequencies still kill noise, but mids and low frequencies have become much better suppressed. They began to make the wire from a different material, it should feel less entanglement, it does not harden in the cold, like the QC15, and more reliable, in general. The ability to switch the wire between "Lo" and "Hi" has disappeared. The design, in my opinion, has become much better, and the materials are more pleasant. Haven't been able to test the comfort in different seasons yet, but I think it's the same.
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