How to increase the sensitivity of the microphone on Android Xiaomi

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The problem of quiet sound when recording voice messages or during video calls on Xiaomi smartphones is familiar to many users. Often, device owners face a situation where people do not hear you well in a noisy room or when recording video from a distance, the sound is lost. This does not always mean hardware failure; in most cases, it is due to software limitations or the misconfiguration of the MIUI system.

In this article, we will take a look at all the methods available to increase the sensitivity of the microphone and improve the quality of audio recording. We will look at both standard system settings and more advanced methods available through the engineering menu. Understanding these mechanisms will allow you to make the most of the audio track of your device.

Diagnostics and basic checks before setting up

Before you start to manipulate the system parameters, you need to rule out the trivial physical causes of quiet sound. Often the problem lies in the contamination of the microphone hole or using the wrong case. On Xiaomi Redmi and Poco models, the bottom microphone is often located next to the charging port, where dust and pile easily enter.

Carefully inspect the ends of your smartphone. If you use a protective case, make sure that its cutouts match the holes for sound. Sometimes even a millimeter shift can significantly reduce the level of incoming signal. You can use a built-in test to check the performance of each microphone (main and additional for noise reduction).

Run the diagnostic mode by typing a special code in the Phone app, which will help you to understand which microphone is not working correctly.

##6484##

Once you enter the code, the CIT menu will open. Select Main Mic to check the main microphone and Top Mic to check the top microphone. Speak to your phone and watch the sound level indicator on the screen. If the stripes are not moving or moving weakly, the problem may be physical.

⚠️ Warning: Do not use sharp objects (needles, pins) to clean the microphone holes.You can damage the safety net or push the dirt deeper, which will permanently disable the component.

If physical cleaning didn't work, it's worth checking to see if third-party apps block access to the microphone, and some call recording software or voice recorders can intercept audio input control and enforce their limitations.

Customization of sound effects and modes in MIUI

The first software step to improve sound is to fine-tune the built-in audio effects. The MIUI shell and the new HyperOS have sections that directly affect signal processing. Go to Settings → Sound and Vibration → Sound Effects.

So what's important here is to look at the equalizer profile, and standard modes like Pop or Rock can distort the frequency range of your voice, making it less legible, and try to choose Standard mode or manually lift sliders in the mid-frequency area where the human voice is normally located.

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Use headphones with your own microphone to record important conversations. The headset's external microphone is often closer to your mouth and has better performance than the one built into your smartphone's body.

It’s also worth checking the settings of the specific app you’re communicating through. Telegram, WhatsApp, or Viber may have their own audio quality settings. For example, some messengers have an option called “Use HD codec” or “Noise suppression” that is sometimes best turned off if the noise reduction algorithms are too aggressive and eat away at the voice.

Special attention should be paid to the voice enhancement feature in the audio settings menu, which may not work properly on some models, artificially lowering sensitivity. Try experimenting with turning this option on and off by recording test audio.

• 🎚️ Check that the media volume slider and call slider is twisted to the maximum during testing.
• 📱 Make sure the Do Not Disturb mode does not block audible incoming signal notifications.
• 🔇 Disable third-party audio improvers (Dolby Atmos, DTS), if they cause distortions.

Use of the Engineering Menu for Calibration

The most effective way to increase the sensitivity of the microphone on Xiaomi Android is to use a hidden engineering menu, which is designed for technicians, but is also available to ordinary users, and you can manually adjust the Gain level for various use cases.

Use the same code ##6484## or ##3646633## to enter the menu (the code may vary depending on the device's processor: MediaTek or Qualcomm). → Audio → Audio Debugging.

Inside, you'll see a list of modes: Normal (normal mode), Headset (headset), Handsfree (loudspeak), and others. Choose Normal mode and Mic type of work. Level 0-6 will be available here. Level 0 is the minimum volume, and Level 6 is the maximum.

You need to find a Digital Gain or Analog Gain, and by increasing its value, you're sensitive, but be careful, too high will cause static noise and wheezing.

When you change the settings, be sure to press the Set button to save. The changes take effect immediately, but for stability, it is better to restart the device. If the sound becomes too noisy, return the values to the original values.

Third-party applications for sound amplification

If you don't have enough system settings, Google Play apps come to the rescue, which allow you to programmatically amplify the input signal, and they act as an intermediary, processing the sound before sending it to a recorder or messenger app.

One of the popular solutions is the Precise Volume or Volume Control app, which allows you to fine-tune not only the volume of playback, but also the input settings, some of which have a "Microphone Boost" feature.

There are also dedicated voice recorders, such as RecForge II or Easy Voice Recorder, which often feature a Microphone Gain slider that allows you to increase recording levels by 10 to 20 dB regardless of system limitations.

On newer versions of Android (11, 12, 13, 14), the security system can block applications from accessing the microphone in the background, which reduces the effectiveness of such amplifiers during calls.

⚠️ Note: Installing applications with deep access to the system may require special permissions. Be careful when granting access rights "Above Other Windows" or "Access to Use", as this can reduce the overall security of the device.

Impact of system updates and resetting settings

Sometimes the silent microphone problem comes up after a firmware update, and developers can change the noise-cancellation algorithms or make errors in the audio chip drivers, and in these cases, resetting the audio settings or completely resetting the device helps.

Try resetting your network and Bluetooth settings first, as they often involve audio routing. Go to Settings → Connection & Sharing → Reset Wi-Fi, mobile networks and Bluetooth.

If the problem persists, there may be software errors in the system. Performing a full reset (Wipe Data) often returns factory microphone sensitivity parameters. Be sure to back up important data before this procedure.

It's also worth checking for updates for specific applications, and sometimes the bug isn't in the system, but in updating the messenger or voice recorder itself.

Hardware restrictions and repairs

Remember that every smartphone has a physical sensitivity limit. Xiaomi’s budget models often feature simple low-signal-to-noise microphones, so that software amplification will only raise the background hiss level, but it won’t make the voice cleaner.

If after all the software manipulations, the sound remains quiet, and the engineered menu levels are already twisted to the maximum, the microphone module itself probably failed, a common problem after falls or moisture.

In this case, only replacing the component in the service center will help, the cost of replacing the microphone is usually low, and the procedure takes a little time, self-repair is not recommended because of the risk of damaging the plumes.

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If the software methods and the engineering menu did not give a result, and the CIT test shows the absence of a signal, a microphone in the service center is required to be replaced.

To prolong the life of the microphone, try not to drop the phone and use protective covers with raised sides. This will save the sensitive membrane from direct contact with surfaces.

Frequently Asked Questions (FAQ)