Phone conversation is a basic feature that Xiaomi smartphones can sometimes work incorrectly due to software failures or features of the MIUI shell. Users often encounter a quiet voice, extraneous noises or an echo effect, which makes communication uncomfortable. The solution lies in both simple manipulation of accessories and deep tuning of system parameters.
In this article, we'll look at all the methods available to improve sound quality without having to go to a service center, learn how to calibrate the microphone correctly, what engineering codes to use for diagnostics, and why a standard speaker can sound deaf.
Before we get to the complex manipulations, we should rule out the trivial causes of sound deterioration. Often the problem lies not in the software, but in the physical state of the device or the malfunction of the network modules. Carefully check the following points so that you do not waste time on unnecessary actions.
Diagnostics and elimination of physical interference
The first thing you need to do is visually and physically look at the bottom of the smartphone. The main speaker grid and the microphone port on the bottom end are often clogged with dust, pocket pile or skin fat, and even a microscopic layer of dirt can jam sound and distort vocal frequencies.
Use a soft toothbrush or dry antistatic brush to clean the holes carefully. It is strongly recommended not to use sharp objects such as needles or pins, as they can easily damage the speaker membrane, which will lead to its complete breakage. If after cleaning the situation has not changed, the problem may be in the protective case.
Some cases, especially thick or unoriginal ones, can block the output of a sound wave or the input of a microphone. Take off the accessory and check the quality of communication. If the sound is better, you will either have to replace the case or cut the necessary holes for Xiaomi speakers.
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Use isopropyl alcohol on a cotton swab to clean the speaker mesh if dry cleaning didn't help, the main thing is not to wet the device abundantly and let it dry completely before turning on.
And you also have to look at the protective film, and if it's not glued neatly and the air bubble is right above the microphone hole, it's going to create a cotton-coat sound, and make sure that all the process holes are free to pass through the air.
Set up equalizer and sound profiles
The MIUI and HyperOS shells provide advanced audio management capabilities. Standard settings are often multimedia-focused, but they can be adapted to improve speech intelligibility. Go to Settings → Sound and Vibration → Sound Effects.
Here you will find an equalizer. For calls, it is recommended to choose a clear voice profile or manually lift sliders in the medium frequency range (about 1000 Hz - 3000 Hz), where the main spectrum of human speech lies, which will make the voice of the interlocutor more clear and distinguish it from the background noise.
In the same menu, check out the Dolby Atmos feature (if available in your model). Try to switch modes: sometimes Auto mode is not working correctly when calling over the cellular network, and you better manually choose Voice or Balance. It is also worth checking for the Sound Improvement feature, which can artificially increase the volume, but sometimes causes distortion.
The "mono-audio" setting deserves special attention. If this option is enabled, the stereo signal is combined into one channel. For calls, this can be useful if one speaker is quieter than the other, but in general for modern devices it is better to keep this feature off to preserve the naturalness of the sound.
Secret Menu of Sound
Use of engineering menus and hidden codes
The most powerful tool for diagnosing and tuning sound is the engineering menu, which allows you to access hidden parameters of the audio codec. To enter the Phone app, type ##6484## or ##3646633# (code may vary depending on the processor: MediaTek or Snapdragon).
In the test menu, select Audio or Audio Debugging. Here you can see the current volume of the speaker and microphone. Pay attention to the Gain setting (amplification). If it is set to a minimum, the sound will be quiet. However, you need to change these values with caution: too high amplification will lead to wheezing and whistles.
| Parameter | Description | Recommended action |
|---|---|---|
| Speaker Gain | Enhancing the underlying dynamics | Checking the level, do not increase above 10 |
| Mic Gain | Microphone sensitivity | Increase if you are not heard well. |
| Headset Gain | Headset reinforcement | Only when using headphones |
| Receiver Gain | Volume of the conversational speaker | Optimize for ear retention |
In the Audio Wizard section (for MediaTek processors), you can select a use case, such as Normal or Handsfree. Make sure you choose the right profile for a normal conversation. Resetting the audio settings to factory values in this menu often helps if previous settings have been knocked down by updates.
☑️ Checking in the engineering menu
⚠️ Warning: Changing unknown parameters in the engineering menu may cause sound to disappear completely or the system to function unstable.
Disabling noise reduction and echo reduction
Xiaomi smartphones today are equipped with noise reduction algorithms (ANCs) that are designed to cut off background noise, but in some situations, such as wind or noisy rooms, these algorithms work aggressively, swallowing the user's voice along with the noise, which creates the effect of intermittent speech.
To check the impact of this feature, try calling with noise cancellation on and off. In some models, this setting is on the Settings path → Special features → Hearing aids (yes, turning on the hearing aid mode sometimes changes the processing of sound). It is also worth looking for the Noise suppression option in the settings of the Phone application itself or in the call menu during a conversation.
If you use third-party calling apps like Google Phone or Viber, their internal noise reduction settings may conflict with the system's. Try temporarily disabling Smart Noise Canceling in the app's settings, which often solves the problem when the person complains that your voice is popping up and going missing.
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Aggressive noise cancellation is a common cause of "quaking" and interruptions to your voice, and if you're in a quiet room, it's best to turn off this function for maximum naturalness of sound.
Echoes in conversation often arise from the microphone picking up the sound from the speaker. Make sure you don't palm the bottom of the phone while you're talking. Also, the echo can be caused by a bad network signal when the data packets are late, and the software settings are powerless.
Optimization of network operation and VoLTE
Sound quality is directly dependent on voice technology. If your carrier and data plan support VoLTE (Voice over LTE), be sure to activate this feature. It transmits high-quality voice over a 4G network, rather than switching the phone to outdated 2G/3G networks during a call.
You can turn on VoLTE through Settings → SIM-maps and mobile networks → Choose yours. SIM → If you don't have a switch, try entering the code ##86583##, which enforces the VoLTE validation for your region and operator.
Sound problems often occur when the signal is weak, and when the phone is at the edge of the coverage area, it starts to increase the power of the transmitter, which can cause crackling and interference. 3G" or "Only." 2G" via the Settings menu → The phone. → The kernel version (multiple pressing) → Settings SIM-maps to capture a more stable, albeit slower, communication channel.
How to Enable Hidden Network Menu
Third-party applications for sound amplification
If the system is not enough, Google Play apps come to the rescue, one of the most effective is Volume Control Plus or Lesser AudioSwitch, which allows you to independently adjust the volume for different types of events, including calls, and bypass the restrictions set by the manufacturer.
Volume Control Plus has a "Boost" feature that can programmatically amplify the signal, but it's worth remembering that the software amplification always introduces digital distortion. Use the boost moderately, raising the volume by 10-15%, no more. Excessive amplification will make the sound hoarse and unpleasant to the perception.
There are also speaker cleaning applications that generate a specific frequency sound wave that pushes water and dust out, such as Sound Cleaner, which runs at maximum volume for 1-2 minutes to clear the speaker grid from internal dust.
⚠️ Warning: When using third-party amplifiers, watch the device heat. The speaker is a physical element, and overloading it can cause the coil to burn out or the membrane to peel off.
Resetting and software update
If none of these methods worked, you may have accumulated configuration errors on the audio drivers. Try resetting the network settings. Go to Settings. → Connection and sharing → Resetting Wi-Fi, mobile networks and Bluetooth, which will not delete your personal data, but will return network settings to factory settings.
Check for system updates. Xiaomi regularly releases patches that fix the modem and audio subsystem bugs. Path to check: Settings → Phone → MIUI version. Sometimes the problem with the sound quality on a particular model is known to developers and is fixed with the update.
In extreme cases, if the problem has occurred after installing an application or update, a complete data reset can help.Be sure to back up before that. A clean system often works more stable than an overloaded system with years of use.