The problem of quiet or poor-quality sound when recording voices and conversations is familiar to many owners of Xiaomi, Redmi and POCO smartphones. Often users are faced with a situation where people complain about noises, echoes or too quiet voices, which makes communication uncomfortable, this can be caused by software restrictions, pollution or improper settings of the system.
In this article, we'll take a comprehensive approach to solving this problem, and you'll learn how to programmatically enhance the sensitivity of the microphone, what engineering codes to use for diagnostics, and when to think about physical cleaning of the device, and fine-tuning can dramatically improve the quality of sound transmission without buying expensive equipment.
Before we go to radical measures, we need to rule out trivial reasons, often just check whether the security glass or the case covers the speaker hole, and make sure that the system does not activate third-party applications that can intercept the control of the audio stream.
Diagnostics and primary inspection of equipment
The first step is always to make a thorough diagnosis, and Xiaomi and Redmi have a powerful engineering menu built in to test all the modules separately, so you can see if the problem is hardware or software, and if the microphone is physically fit, the software adjustment will be great.
To run the test, type ##6484## in the dialer. In the CIT menu that opens, look for items related to sound, usually sections like "Main Mic," "Secondary Mic," or "Top Mic," and after you run the test, you'll hear the device record and play your voice.
- 🔍 Check the main bottom microphone by recording the voice and comparing the volume to the reference.
- 📞 Test the top noise reduction microphone by holding the phone in your hand during the test.
- 🎧 Make sure that when you connect the headset, the system correctly switches the sound sources.
If the sound is intermittent, quiet, or completely absent even at maximum volume, there is a high probability of physical malfunction, in which case software methods may not help, and interference with the hardware will be required.
📊 What's your problem with the microphone?
The interviewee doesn't hear me well.
Lots of extraneous noise and hissing
The microphone wheezes when talking loudly
It's sounding, but it's very quiet.
System settings and engineering codes
One of the most effective hidden features for Android smartphone owners is access to advanced audio settings, which on MIUI and HyperOS devices can change the sensitivity of the microphone through the engineering menu, which allows you to strengthen the input signal, which is especially important for low-end models.
To access these settings, the code ##3646633## is often used. Once in the menu, go to the Hardware Testing tab, then select Audio and Audio Debug. Here it is important to be careful: changing the wrong settings can lead to distortions.
⚠️ Note: Changes to the engineering menu are done at your own risk, write down the initial values before changing so you can revert back to the background if the sound quality deteriorates.
In the Microphone Gain section, you can find gain sliders. The standard value is usually around 100-120 dB. An increase of 10-20 can make the voice much louder. However, excessive amplification will cause background noise and hissing.
Secrets of the Audio Debug tab
You can also set up microphone types (Handset, Headset, Speaker) in this section. Make sure you change settings specifically for Handset mode if the problem occurs during normal conversations without a headset. > Cleaning and physical maintenance Often the cause of bad sound is banal dust, pile and skin fat, which over time clog the microphone grid. The hole located at the bottom of the case actively sucks dirt from pockets and bags. Regular cleaning is the easiest way to improve the situation. To clean, use a soft toothrot or a high-pressure micleaflet, which will also lead to the use of a soft toothmock or a toothmock, so that it is recommended to use it for a full blowing. ☑️ Cleaning the microphone Turn off the smartphone Use a dry soft brush Carefully remove dust from the mesh Clean with an alcohol napkin (without getting moisture inside) Check the result by recording the recorder: 0 / 5 If the sound didn't improve after cleaning, it might have penetrated the contamination or oxidized the contacts, and then you might need to disassemble the device, and if you have the skills, you can gently remove the bottom cover and blow the speaker, but you'd better trust the technicians to do that. If standard settings are not enough, specialized applications from Google Play come to the rescue, which allow you to more flexibly manage the audio stream, using noise reduction and signal amplification algorithms. This is especially useful for bloggers who are recording videos on their phones. One popular solution is the Lesser AudioSwitch app. It allows you to force the active microphone to be selected and changed, and there are also programs for recording sound with high quality that ignore system constraints. 📱 Lesser AudioSwitch – for manual control of sound sources. 🎙️ RecForge II — Professional voice recorder with amplification setting (Gain). 🎚️ Volume Control Plus is a way to fine-tune the volume levels of the system, and when you install these applications, be sure to give them all the permissions you want, and without access to the system, they can't change the audio driver settings. However, remember that third-party software can consume more battery power. The method of improving sound depends on your specific situation and smartphone model. Below is a table that will help determine the best way to solve the problem. Method Efficiency Risks Grid Cleanup Average Low Minimum Engineering Menu High Average (setting reset) Third-party applications Medium Low (battery) Replacement of module Maximum High Warranty Loss As seen from the table, software methods often produce good results at minimal cost. However, if the problem lies in the physical wear of the membrane, only a component replacement will help. Elimination of software conflicts Sometimes the microphone works poorly due to conflicts in the operating system. This can be caused by an error after updating the MIUI or the activity of the application's background reset or the application's activity on the "Try of the sound mode" help to identify the "Disk" or the culprise of the application on the system. Go to Settings. → Annexes → All applications, find the system audio services and select "Clear cache." This won't delete your data, but will update the configuration files. If the problem occurs after you install an application, delete it and check the microphone. Often messengers or voice recorders can “hang” in the background, blocking other programs’ access to the microphone, which causes recording errors. ⚠️ Warning: Full reset to factory settings (Hard Reset) will delete all your data. Use this method only if other methods have not worked, and make sure to back up. When repairs are needed, there are signs that it is no longer possible to improve the situation software. If the microphone makes a crack, a squeak or sound disappears at the slightest shaking of the body, most likely the plume has moved away or the module itself is damaged. It's also worth contacting the service if there's moisture inside the device, and even if the phone keeps working, it's a matter of time before the microphone contacts corrosion, and in such cases, ultrasound cleaning or replacing the part becomes the only option. 💡When buying a new smartphone, immediately purchase a protective film with cutouts under the speaker or a case with a raised side. This will prevent direct contact between the microphone grid and the surface of the table and pocket. Don't ignore the sound problem, because a faulty microphone can interfere with the noise cancellation function, making it impossible to talk in noisy places. Timely diagnosis will save time and money. Why does the microphone only wheez in messengers? Often the problem lies not in the microphone itself, but in the algorithms of sound compression in applications like WhatsApp or Telegram. Try to lower the bitrate of the recording in the settings of the application itself or check the permissions to access the microphone. Will flashing help? Yes, if the problem is caused by a software bug in a particular version of MIUI. Installing a global version of the firmware or rolling back to a more stable version can correct audio drivers errors. Can I connect an external microphone? Yes, through a Type-C or Mini-Jack connector (if any) you can connect a loop or studio microphone. The system automatically switches to an external sound source, ensuring professional quality.