The problem of overly high recording on Xiaomi and Redmi smartphones is common, especially in budget and mid-budget models. Users complain that people hear background noise, rustle of clothes or echoes, and when recording video, the sound becomes distorted and crackling. This is because engineers often adjust the sensitivity of the microphone to the maximum to ensure that speech is legible even in quiet rooms, but in loud environments this leads to the opposite effect.
Fortunately, MIUI and HyperOS provide a number of tools to fine-tune audio input, although they are not always on the interface surface. In some cases, the reduction of sensitivity requires the use of third-party software or the activation of hidden engineering menus. Completely disabling noise cancellation is often a key factor, as algorithms try to “amplify” the quiet voice by artificially upping (gain) recordings.
In this guide, we'll look at all the methods available, from simple in-app settings to CIT's engineering menu. You'll learn how to eliminate cracking when recording videos, improve the quality of voice messages in instant messengers, and make calls more comfortable for your interlocutors. It's important to understand that software sensitivity restriction is a balance between purity of voice and no extraneous noise.
Standard sound settings in Xiaomi applications
The first step should always be to check the built-in settings of the particular app you most often communicate with or record through. Xiaomi’s standard voice recorder and camera have their own audio processing algorithms that can conflict with system settings. For example, the Camera app often activates automatic amplification mode, which does not allow you to manually reduce sensitivity without switching profiles.
To start, open the Camera app and go to settings by tapping three bars in the corner of the screen. Find the section related to video or sound. There may be an option to cancel noise or choose the type of microphone. Disabling this feature in a quiet room can paradoxically make things worse, but in a noisy place it often causes the phone to "scream" instead of talking.
If you're using a voice recorder, click on the three dots in the top right corner and select "Settings." Some versions of MIUI have a sound quality switch. Choosing "Interview" or "Concert" mode over "Normal" can change the way the ADC works, making the recording less sensitive to loud surges.
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In the Camera app, try switching to the "Profi" or "Video" mode, where manual audio recording level settings (dB slider) are sometimes available, which are not available in the normal photo mode.
It is also worth checking the settings of Bluetooth headsets if there is a problem when using them. In the Settings → Bluetooth menu, find the connected device, click on the gear and make sure that the Audio or Speak profile is set up correctly. Sometimes resetting the pairing helps recalibrate input levels.
Using the CIT Engineering Menu for calibration
The most effective way to affect the hardware sensitivity of the microphone is to access the CIT (Customer Integration Test) menu, a hidden part of the system designed to test equipment in the factory, but accessible to users through a special code, where you can check the performance of each microphone separately and, in some cases, change the parameters of their sensitivity.
To enter the menu, open the Phone app and dial the code ##6484##. If the code doesn't work, try ##4636## or find the Service and Feedback app in the Tools folder, then click multiple times on the app version. In the menu that opens, look for the Microphone or Audio section.
Inside the section, you'll see a list of available microphones (usually two or three: top, bottom and noise reduction) and select the one you want to run the test. During the test, you can see the current signal strength in decibels. While direct change (amplifications) are often blocked for ordinary users, the mere fact of running the test can reset the software gain to factory values, removing accumulated calibration errors.
What to do if the engineering menu is empty?
It is important to understand that changes to the engineering menu can be reset after a system update or reset. If you find a setting responsible for Microphone Gain, change its values Step-by-step, no more than 2-3 units at a time, and immediately check the result with a record.
☑️ Checking microphones in CIT
Set up third-party applications to record
If Xiaomi’s standard tools don’t allow for the desired sensitivity reduction, specialized applications from Google Play come to the rescue. Third-party voice recorders and cameras often have their own audio processing drivers that ignore system limitations and allow you to directly control the input signal.
The popular Open Camera app or RecForge II (for audio) gives you complete control over the recording levels, and you can find the Audio or Sound section in the settings of these programs and activate Manual Gain Control, which allows you to visually lower the microphone volume slider, effectively reducing its sensitivity by software.
When using these applications, it is important to choose the right audio source (Audio Source). Try switching from "Default" to "Camcorder" or "Microphone". The source "Camcorder" often has more aggressive compression, which can help avoid overloading with loud sounds, while "Microphone" gives a cleaner, but more sensitive signal.
Remember that installing third-party apps with microphone access requires careful permissions. When you first start, the program will request access to the recording device - this is necessary for the job, but make sure you download the application from a trusted developer to avoid leaking sensitive information.
Effects of accessories and physical factors
Often the cause of the sensitivity and the appearance of extraneous noise is not in the software, but in the physical condition of the device or accessories used. Protective covers, especially thick or improperly selected, can block the holes of the microphones, creating a “barrel effect” or causing the system to automatically increase the gain to compensate for deaf sound.
Remove the case and check if the microphone holes are closed. Xiaomi smartphones usually have two: one at the bottom (main) and one at the top (for noise reduction). If the top hole is closed with a finger or the edge of the case, the noise reduction algorithms begin to work incorrectly, amplifying the background hum instead of removing it. Regular cleaning of the microphone nets with a soft brush also helps restore normal signal level.
Another physical factor is the presence of magnetic rings or holders near the microphones. Magnetic fields can create tips that the processor perceives as low-frequency noise, causing the system to increase sensitivity. If you use a magnetic case, try temporarily removing it to check the sound quality.
⚠️ Warning: Do not use sharp objects (needles, toothpicks) to clean microphones. You can damage the membrane or push dust deeper into the case, leading to irreversible loss of sound quality or complete failure of the microphone.
Comparison of methods of reducing sensitivity
The choice of method depends on your specific situation: whether you are recording a lecture, making a video for a blog or just want to be heard better in instant messengers. Below is a table that will help you compare the effectiveness of different approaches.
| Method | Efficiency | Difficulty | Risks. |
|---|---|---|---|
| Camera app settings | Low. | Minimum | Absent. |
| CIT's Engineering Menu | Tall. | Medium | Resetting settings when updating |
| Third-party annexes | Very high. | Low. | Advertising, access to data |
| Physical cleaning/cover change | Medium | Minimum | Damage during cleaning |
As you can see from the table, the most flexible tool is third-party applications that give you full control over recording parameters, but for everyday calls and fast videos, the best combination of the right physical setting (clean case) and standard noise reduction functions is the best.
If none of the software methods work, the problem may be a hardware malfunction of the microphone module itself, in which case the sensitivity reduction is impossible because the module is running at its limits or has a factory defect.
Solving problems with echoes and extraneous noise
High sensitivity is often accompanied by an echo effect, especially when using hands-free communication. This occurs when the sound from the speaker hits the microphone and is amplified again. On Xiaomi devices, the AEC (Acoustic Echo Cancellation) algorithm is responsible for combating this.
To minimize echoes, try lowering the overall volume of the speaker during a conversation. The quieter the sound from the speaker, the less likely it is to hit the microphone. Also effective is using a headset that physically carries the sound source and the microphone apart, breaking the feedback loop.
In some cases, enabling Mono-audio in special features helps. Go to Settings → Advanced Settings → Special features → Hearing and turning on Mono-audio. This will combine stereo channels, which sometimes allows the system to process the incoming signal more stable and reduce sensitivity to phase distortions perceived as noise.
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Comprehensive approach: the combination of physical cleaning of microphones, the use of high-quality covers and competent software configuration gives the best result in the fight against excessive sensitivity.
⚠️ Warning: Avoid using Volume Booster app at the same time as trying to reduce microphone sensitivity, and these programs are in conflict with each other, which can lead to complete disappearance of sound or severe distortion (wheezing).