The problem of quiet or poor-quality sound when talking is familiar to many owners of Xiaomi, Redmi and POCO smartphones. The interlocutors complain of extraneous noises, echoes or simply can not make out your speech, which turns ordinary business calls into a test. Often users immediately run to the service center, believing that the hardware is out of order, although in most cases it is due to software failures or banal dirt.
In this article, we will discuss how to improve the sound of the microphone on a Xiaomi phone using built-in system tools, engineering menus and proper physical cleaning. You will learn to diagnose the problem yourself without resorting to expensive repairs, and you can return your device to crystal audibility. The quality of recording and voice transmission directly affects the comfort of using the gadget, so you can not ignore these settings.
Before we get into the tricky stuff, we need to understand that smartphones today have multiple microphones for different tasks. Xiaomi uses complex noise-cancellation algorithms that sometimes work incorrectly, jamming or blocking the voice completely. Understanding how your device’s audio subsystem works is the first step to solving the problem.
Physical cleaning and inspection of accessories
The most common but often overlooked cause of bad sound is contamination of the microphone opening, and the mesh is filled with dust, pocket pile and skin fat, which significantly reduces the sensitivity of the sensor. Before you go into the settings, take a soft toothbrush or a dry cotton swab and carefully clean all the holes on the case.
Pay attention to protective covers and films. Cheap or incorrect accessories can block the sound from accessing the microphone. Take off the case and check if the cutouts on it match the actual location of the microphones on your Xiaomi. Sometimes even a small shift of film by 1 millimeter can completely drown out the sound.
⚠️ Warning: Never use sharp objects such as needles or pins to clean the microphone.You can pierce the membrane or damage the moisture mesh, resulting in irreversible breakage and loss of warranty.
It’s also worth checking if your phone has Bluetooth headsets or speakers in the background.The smartphone can automatically switch the output and input to an external device that’s in another room.Switch off Bluetooth completely and check the sound quality through the main speaker.
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Use paint tape to clean the microphone mesh: press the sticky tape against the hole and sharply tear off to pull out the stuck dust without damaging the internal components.
Basic sound settings in MIUI and HyperOS
Xiaomi’s operating shells provide a wide range of settings that can affect the microphone. First of all, check the Sound and Vibration section in the basic settings. Here, it is important to make sure that the media and call volume are set to a sufficient level, and the Do Not Disturb mode does not block incoming calls.
Special attention should be paid to the functions of "Sound Improvement" or "Mi Sound Enhancer." In some models, these settings may conflict with the algorithms of the microphone when calling. Try to turn off all sound effects and equalizers to see if things change. Digital signal processing sometimes introduces distortions that are perceived as bad sound.
- 🎧 Check the Bluetooth audio codec settings in the Developer Menu if you have experience with this section.
- 🔇 Make sure that you do not close the bottom of the phone where the main microphone is located.
- 📱 Restart the device in Safe Mode to eliminate the impact of third-party applications on the sound.
If you use a headset, check its compatibility. Some cheap models may not work properly with a 3.5mm connector or USB-C port, creating resistance that the phone interprets as an error, in which cases the analog signal may be too weak for normal voice transmission.
Diagnostics through engineering menu and tests
To get a deeper look at the microphone status of Xiaomi smartphones, there is a special CIT engineering menu that allows you to test each microphone separately and see if the hardware is working at all. To get there, open the Phone app and enter the code ##6484##.
In the menu that opens, find the item associated with the microphone (usually called "Main Mic," "Top Mic," or "Sub Mic"). Press it and say something. You should see how the sound level indicator reacts. If the graph is not moving or moving very weakly, the problem may be hardware.
CIT login code: ##6484###
Alternative code: ##4636##And you can also do a speaker test on this menu to make sure that the problem isn't the audio playback of the person, and users often confuse the quiet sound of the speaker with the quiet microphone, and separating these concepts is critical to proper diagnosis.
☑️ Microphone diagnostics
| Type of microphone | Location. | Function | Signs of malfunction |
|---|---|---|---|
| Main Mic | Lower end | Main conversation | The interviewer can't hear you. |
| Top Mic | Upper end | Noise suppression | Intermittent sound, echo |
| Rec Mic | Rear panel/camera | Video recording | Bad sound in the video |
Use of the Engineering Menu for Calibration
More advanced users can log in to the engineering menu via code ##3646633##. Here you can find the Hardware Testing section -> Audio -> Audio Debug. However, be very careful: improper setting of gain parameters can lead to wheezing or complete disappearance of the sound.
In the Microphone section, you can check the current gain level. If the value is too low, the sound will be quiet. But remember that the standard values are calculated by engineers for optimal operation, and changing them is a risk. It is better to first try resetting the audio settings through the Recovery menu, if this option is available for your model.
⚠️ Warning: Changing the settings in the engineering menu 3646633 may cause the audio module to fail software.
There's a myth that raising the Gain in the engineering menu works wonders, and in fact it only increases the noise level with the voice, and it's much more effective to check if the default "Speak" mode is activated in the call settings, which uses a different microphone algorithm.
Hidden commands for sound testing
Third-party applications for improving sound
If standard tools aren't enough, Google Play Store apps come to the rescue, programs like Lesser AudioSwitch or Microphone Switch force you to choose the source of the sound and control the microphone at the software level, which is especially useful if the system has forgotten to switch to the external microphone of the headset.
To record quality sound (podcasts, interviews), it is better to use specialized voice recorders such as RecForge II or Dolby On. They have their own noise reduction and compression algorithms that often work better than standard Xiaomi tools, these applications allow you to adjust the bitrate and sampling frequency.
- 🎙️ Use applications with function «AGC» (automatic gain adjustment) for equalizing the volume of the voice.
- 🎚️ Set up an equalizer in the recording app to remove the low-frequency hum.
- 📡 Check App Permissions: The microphone should have access to “Always” or “Only when in use».
Remember that third-party apps can conflict with MIUI system settings. If the sound gets worse after installing such a program, delete it and restart the phone. The most common mistake is the simultaneous operation of two applications trying to grab over the microphone.
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Third-party applications are a crutch, not a solution. If a standard voice recorder writes quietly, the problem goes deeper than just software, and requires a system or hardware check.
Resetting and system update
Software bugs are a common cause of sound problems after MIUI updates. If nothing helps, try resetting all applications. Go to Settings → Apps → All apps → three dots in the corner → Reset all apps. This will not delete your personal data, but will return the settings of system components to the factory.
Check for system updates. Often Xiaomi will release patches that fix exactly the problems with audio codecs or microphone drivers. Go to Settings → About Phone → MIUI version and click “Check Updates.” If you use beta or custom firmware, consider returning to a stable version.
In extreme cases, a full reset to the factory settings (Hard Reset) helps. Before you do this, make sure to back up the data. This will eliminate the influence of any third-party factors, viruses or conflicting settings. Once reset, the phone will be like new, and you will immediately understand whether there was a problem in the software.
⚠️ Warning: A complete data reset will delete all photos, contacts and apps. Be sure to back up to Mi Cloud or your computer before performing this procedure.
If even after a complete reset and check in a clean system, the microphone is not working well, the probability of hardware failure is close to 100%, in which case the software methods will not help, and the intervention of specialists will be required.
When it’s time to carry your phone for repair
There are a number of signs that indicate a physical breakdown of the microphone module or plume, and if the phone falls, falls into the water or just lasts several years, the wear of the components is inevitable, in which case no adjustments will be able to restore the damaged membrane.
Please contact the service center if:
- 🔇 The microphone does not work at all (complete silence when recording).
- ⚡ There is a crack, static noise or whistle that does not disappear after cleaning.
- 💧 The device has been in contact with water, even if it has protection. IP68 (The warranty often does not cover the liquid).
Replacing the microphone in Xiaomi smartphones is a relatively inexpensive procedure, but requires skill. In modern models, the microphone is often soldered into a sub-board or part of a charging plume. Self-replacement can damage other components, so it is better to trust this to the professionals.
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When contacting the service, be sure to show a video with the CIT test, where you can see that the microphone does not respond to sound - this will speed up the diagnosis by the wizard.