How to improve phone speaker?

Question

Audio

There is a Samsung Galaxy Wonder phone, it, like many other phones, has a drawback associated with the sound of the speaker.
At a frequency of approximately 550 Hz to 900 Hz, some wheezing is heard, and the piano plays at approximately this frequency, and when you listen to music from the piano, it is impossible to listen to it. These overtones are in no way connected with the amplifier, because I disassembled the phone and turned on the speaker without acoustic design and with a different amplifier.
Acoustic design "closed type", i.e. the back side of the speaker is closed, and on the front there is a slot (2.5 * 6mm) through which the sound comes out.
Is it possible to somehow improve the speaker so that there is no such distortion?
Here is an example of distortion

Answer 1

The ringer speaker is not intended for listening to music. It serves to create a sound signal for calls, an alarm clock. If the speaker cannot be separated from the case, then you will not get the desired result. If it can be separated, then you can put the original speaker from Nokia 6300/6500s or other quality speakers that are compatible in design. Perhaps you need to select the inductance, capacitors to cancel the desired noise.