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Refer to manufacturer technician locally. Suggest speaker replacement. Vacuums ruin speakers. !!Danger!! Do not blow or vacuum speakers. The cause is coil displacement possible electronic disconnection.
Typically the left or right knob should adjust the volume by turning it counter-clockwise. However, some companies need to make this a bit more advanced or difficult. If this is the case, you can try pressing the audio button on the device. If it provides you with any options on the screen, search for anything which indicates changing the volume control. (It may also be under Menu)
Once you do that you should be able to turn the sound down with either the knob on the left or the arrows on the right.
Thats a normal situation evevery cell has two speakers one is for normal conversation and the other one is for loud music n all your normal speaker has died either u need to replace it. Hope its not embeded on your main board.