well this is clearly for those who r experiencing low volume issues on either side or one side of the earphones #
>> Remove those ear buds from the affected side of the earphones.
>> take off the tiny circular mesh carefully and keep it aside.( u need to put it back in place later)
>> u Wil now able to see a cylindrical sponge near to the sound vent ..All u have to do is, just push that sponge gently back to its place with the help of 3.5 mm pin.
>> gud luck