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Dust, debris or moisture in front of the speaker may often cause a muffled or low speaker. Begin by dusting the speaker with a soft brush, microfiber cloth or compressed air. Do not keep sharp objects that can break it. Make sure that the audio settings of your phone are set to exclude any volume limits or sound improvements that might alter the volume. Reboot and sound test other applications. In case the problem continues, it may be a hardware problem that will have to be inspected or fixed by a professional. Know more about speaker repair