I bought it as a universal device, and listen to music and for talking in headset mode. As headphones, they are very good. I don’t really understand sound, and in other reviews about the sound they have already written enough not to repeat myself, I can only say that the bottoms in these headphones surprised me very pleasantly. At high volume, there is a feeling that the brain begins to vibrate :) When connected via Bluetooth, I personally did not hear the difference, but, to be honest, I was not particularly puzzled by the comparison. When used in headset mode, certain disadvantages appear. The most unpleasant thing is that if you need to attend a meeting, then you can’t move far from the computer, because it’s impossible to turn on / off the microphone on the headphones. Well, the impossibility of connecting by wire - if the battery is suddenly discharged (and this can happen at any time), then that's it, you need to get a spare wired headset. I bought 6500 at a very good price - for that kind of money, IMHO, these are the best headphones.
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