If one earbud sounds quieter than the other, this is usually a fit or settings issue rather than a hardware fault.
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Gently clean the mesh filter on the rubber ear tips and the metal mesh underneath using a cotton swab dipped in a little rubbing alcohol.
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Fully charge the earbuds and reset them by following these steps:
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Place the earbuds in the charging case and leave the case open.
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Press and hold the button on the charging case for 10 seconds until the LED indicator flashes quickly 3 times, confirming the reset is successful.
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Check the audio balance settings on your connected device:
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Android: Go to Settings > Accessibility > Audio & On-Screen Text > Audio Balance.
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Apple: Go to Settings > Accessibility > Audio / Visual > Balance.
Samsung: Go to Settings > Accessibility > Hearing Enhancements > Connected Audio Balance.
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Note: Shifting the balance to the left will make the left earbud louder and the right one quieter, and vice versa.
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