Xiaomi’s Mic Calibration: How to Improve Sound Quality in 5 Minutes

Poor sound quality when calling or recording voices on Xiaomi is a common problem that is often solved by simple microphone calibration. Even in the new Redmi Note 13 Pro+ or POCO F6 models, users experience noise, muted voice or echo. The reasons can range from software failures to physical clogging of the microphone hole, but 80 percent of the time, the correct setting without going to the service center helps.

In this article, you will find the latest ways to calibrate the microphone for all modern Xiaomi smartphones, including models on MIUI 14/15 and HyperOS. We will analyze both standard system tools and hidden engineering menus that the manufacturer does not advertise.

Signs of malfunctioning microphone on Xiaomi

Before you start calibrating, it's important to make sure the microphone is the problem, not the dynamics or network settings. Here are the key symptoms that indicate you need to adjust:

• 🔊 The interviewer does not hear your voice when calling (even at a good signal level)
• 🎤 When recording voice messages on WhatsApp or Telegram, the sound is distorted or interrupted.
• 🔇 In speech recognition apps (Google Assistant, Alice) commands are not recognized the first time.
• 📱 A system notification appears: “Microphone is busy with another application” for no apparent reason.
• 🔧 After the phone falls or moisture hits, the microphone began to work quietly.

These problems are especially common on the Redmi 12C or POCO M6 Pro, which use less secure microphones, but even flagships like the Xiaomi 14 Ultra are not immune to software failures after updates.

⚠️ Note: If the microphone doesn't work at all (no voice response in any applications), the problem may be hardware, in which case calibration won't help - diagnostics at the service center are required.

Preparing the phone for calibration

Before setting up the microphone, follow a few mandatory steps to eliminate external interference:

1. Clean the microphone hole from dust and dirt. Use a soft brush or compressed air (not metal objects!). On most Xiaomi models, the main microphone is located at the bottom of the case next to the USB-C connector.
2. Check if the microphone covers the cover or protective film, especially for models with microphone cutouts (Redmi Note 12 Pro).
3. Disable all applications that can use the microphone in the background (TikTok, Instagram, call recording programs).
4. Make sure your phone has the latest version of MIUI or HyperOS installed. Go to Settings → About Phone → System Update to check.

If you’re using Xiaomi with a 3.5mm headphone jack (like the Redmi A2), check if the headset is inserted – the system can automatically switch the microphone to the headphones.

Method 1: Calibration through standard settings

Since MIUI 12, Xiaomi has introduced a hidden section for microphone testing, which works on 90% of modern devices and does not require superuser rights.

Instructions:

1. Open the phone app and dial the combination: ##36446337###
2. You will be placed in the engineering menu (some models will require you to enter a password - standard 1234).
3. Select Audio → Normal Mode → Mic.
4. In the Level section, set the value of 6 (the optimal level for most scenarios).
5. Press Set to save and restart the phone.

After the reboot, check the sound quality in your Voice Notes or during a call. If the voice gets too loud or there are distortions, go back to the menu and reduce Level to 4-5.

Remove dust from the microphone |

Close the background annexes|

Check system updates |

Record the current sound settings-->

Method 2: Use of the Equipment Test application

MIUI and HyperOS have a built-in application for diagnosing hardware components, including a microphone, that allows you to not only test, but also calibrate sensitivity.

How to use:

1. Go to Settings. → The phone.
2. Click on MIUI Version (or HyperOS Version) 5 times in a row until the message “You are a developer” appears.
3. Return to the main settings menu and open Additional → Equipment Test (on some models the path may differ: Settings → Special features → Equipment Test).
4. Select a Microphone and follow the instructions on the screen, and the system will prompt you to say a few phrases to analyze the signal level.
5. According to the test results, the application will automatically select the optimal parameters or offer to manually adjust the sensitivity.

On models with HyperOS (e.g. Xiaomi 14 or Redmi K70), the microphone test can be in the Diagnostics section inside the Settings → System and Device menu.

Method 3: Manually configure through the engineering menu (advanced)

For power users who want fine-tuning, the method will be suitable via the MTK engineering menu (available on phones with MediaTek processors, such as the Redmi Note 12 5G or POCO M5s).

Step-by-step:

1. Open the phone app and type in: ##36446337##
2. In the menu that appears, select Hardware Testing → Audio.
3. Go to the Mic section and pay attention to the parameters: Mic Volume – total volume (recommended value: 200-250) Mic Gain – signal amplification (optimum: 3-5 dB) Noise Suppression – suppresses background noise (turn on if calling in noisy places)

Set

On smartphones with Qualcomm Snapdragon processors (such as the Xiaomi 13 Pro or POCO F5 Pro), the engineering menu may look different.

##4636##

Audio Information

⚠️ Warning: Incorrect settings in the engineering menu can lead to complete loss of sound.If the microphone stopped working after the changes, reset to factory settings via Settings → Resetting settings.

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Before you change the parameters in the engineering menu, take a picture of the current values, which will help to bring everything back if the sound quality deteriorates.

Method 4: Calibration with third-party applications

If standard methods don’t work, you can use Google Play apps that offer more flexible settings and signal level visualization.

Top.-3 tested applications:

• 🎛️ Microphone Test is a simple, real-time, volume test that helps you determine how well the microphone picks up sound.
• 🔧 SoundAbout – allows you to manually choose which microphone to use (main, for noise reduction or front), useful if the system does not correctly determine the active microphone.
• 📊 Audio Tuner is an advanced calibration tool with the ability to save profiles for different scenarios (calls, video recording, streaming).

Example of settings in SoundAbout:

1. Install the application and open it.
2. In Media Audio, select Use wired headset mic (if you use a headset) or Use phone mic (for a built-in microphone).
3. Enable Force use to apply settings to all applications.
4. Restart the phone for stable operation.

Note that some applications require ADB rights to work properly, and if you are not willing to provide them, use only the basic features.

What if calibration doesn’t help?

If the microphone is still not working well after all the manipulations, the problem may be deeper.

1. Check the physical condition of the microphone: Light a flashlight into the microphone hole - if moisture or oxidation is visible, professional cleaning is required. Blow into the hole (without strong pressure!) - if you hear a crunch or gurgle, it is likely that liquid has entered the hole.

Test the microphone in safe mode:

Press the power button, hold your finger on "Stop" and select "Safe Mode." If this mode is running normally, the problem is in one of the installed applications.

Check the network settings:

On some Xiaomi models (especially VoLTE-enabled ones), poor communication quality may be masked as microphone problems. → SIM-maps and mobile networks → Challenge LTE and check the sound.

Update or reinstall the firmware:

If the problem has occurred after the update, try rolling back to the previous version of MIUI via Settings → System Update → Three Points → Select the Service Pack.

If none of the methods worked, most likely, the microphone module itself is defective. In this case, contact the Xiaomi service center - replacing the microphone costs an average of 800-1500 rubles depending on the model.

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Before visiting the service center, back up your data via Settings → Memory → Backup. Repair may require a complete phone reset.

FAQ: Frequent questions about microphone calibration on Xiaomi