Noise reduction - one hiss. Generally turned off. It is not clear why it is needed. Everything else suits. I will add that the sound stage via bluetooth is slightly wider than via wire, so listening to music via bluetooth is much more pleasant, despite the fact that the sound quality with the LDAC codec is similar to wired. Before that, I put drivers for Denon AH D9200 (bought on Aliexpress) into Sennheiser HD 350BT headphones, I listened to them for more than a year and was pleased with the sound, but now having rearranged the drivers to this model, I understand that now ideal headphones exist, at least for me.
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