If phone calls sound muffled and you can barely hear the caller even with volume at 100%, the microscopic acoustic mesh slit is clogged with dust or ear wax.
Why This Problem Happens
- Acoustic mesh blocked by debris.
- Mono Audio balance slider shifted off-center in Accessibility.
Step-by-Step Troubleshooting Procedure
Step 1: Clean the Top Earpiece Mesh with a Soft Toothbrush
Objective: Dislodge acoustic blockages.
- Use a dry, clean soft-bristled toothbrush or anti-static brush.
- Gently brush across the top speaker slit from left to right at an angle to dislodge impacted debris.
Step 2: Check Audio Balance in Accessibility Settings
Objective: Verify channel centering.
- Open Settings > Accessibility > Audio & Visual.
- Scroll down to the Balance slider and ensure the tick mark is perfectly centered between L and R.
Step 3: Turn Off Phone Noise Cancellation
Objective: Prevent voice filtering errors.
- In Audio & Visual settings, toggle off “Phone Noise Cancellation” to test if voice clarity improves.
Verified Troubleshooting Tips
- Never use liquid alcohol or compressed air directly into the speaker mesh, as high pressure will rupture the acoustic waterproof membrane.
Frequently Asked Questions
Why is speakerphone loud but earpiece quiet?
Speakerphone uses the bottom speaker grille; the earpiece uses a separate microscopic acoustic transducer at the top of the phone.