Review on Bluedio T2s Bluetooth Headphones: 57mm Driver Foldable Wireless Headset with Mic - 40 Hours Play Time (Blue) by Wiktor Pozna ᠌

Many booming bass, midrange and treble failed. After opening, it turned out that the speakers were damped by a very dense non-woven material (it was practically not blown through). I had to carefully peel it off and stick a less dense material. As a result, the midrange and treble became a little larger, the bass became less resonant. After refinement, it became possible to listen to music (but they do not reach the level of Axelvox 241)