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Hello In the first days when I bought the phone, I was very disappointed with the quality of sound on the phone, reading the different information about the sound, it became clear that this is not the most dynamic speaker in his box, so it is reparable. A couple of months when I was completely disappointed with the sound on the phone, tried to make there own hands.
And so what I did.

1. Dismantled the phone.


2. Took out a speaker along with his acoustic box))) like this, only without the patch



3. Carefully bend the plaster, like this



4. Everything turned out like this



5. When assembled the whole thing, the sound was better, not because the phone trap in all the kracks.
You can still play with the equalizer settings, remove the first scale bass, middle, and put in order to increase the top, then I think you yourself under the care of all lined up.
PS: Apologies for photo quality, images are made to your old lady nokiyu 6290.
PPS: As far as possible I will experiment and post Old that, as he did and what came of it.