Sound problems during conversations often come as an unpleasant surprise for smartphone owners, especially when the interlocutor complains of a quiet voice or extraneous noise. Owners of Xiaomi Redmi 8 Pro are no exception, since the design features of the case and software algorithms for processing sound sometimes require manual adjustments. Proper microphone settings can not only improve audibility, but also significantly improve the quality of recording video and voice messages in instant messengers.
In this article, we will take a closer look at all the available methods for optimizing the sound recording devices built into your gadget. We will look at both standard tools of the MIUI operating system and hidden engineering menus that give access to deep calibration. Understanding the principles of noise reduction will help you avoid common errors that often lead to poor communication quality.
Before you go into complex manipulations, you need to eliminate the banal physical obstacles, make sure that the protective film or cover does not overlap the bottom hole of the microphone located next to the charging port, even a microscopic layer of dust or pile can reduce the sensitivity of recording by several times, making conversations almost impossible.
One of the most common causes of bad sound is a software failure or conflict of applications using audio stream. Rebooting a device often solves the problem by resetting temporary errors in the driver operation. However, if a simple restart did not help, a deeper intervention in system settings and hardware verification will be required.
Basic setting of sound parameters in MIUI
You should start troubleshooting by checking the standard settings provided by the MIUI shell. There are basic regulators in the phone menu that allow you to adapt the device to your preferences. Often users accidentally change these settings, which leads to incorrect sound during calls.
Go to the settings section and find the sound and vibration section, and it's important to look at the volume sliders, because the media level and the call level are separately adjusted, and you need to make a test call to set the microphone when you're talking and use the side volume buttons at that moment.
- 🔊 Open the Settings. → Sound and vibration to access the main sliders.
- 📞 Press the volume button during the call to make sure it is not at a minimum.
- 🚫 Check if Do Not Disturb mode is activated, which can block some audio notifications.
Importantly, some versions of the firmware have a feature called "Sound Improvement," which may not work properly. Try turning off the various audio effects to see if things change. Sometimes processing algorithms try to suppress the noise, but eventually drown out the speaker's voice.
⚠️ Warning: If after resetting all the sound settings the problem persists, it is probably not the software sliders, and hardware malfunction or contamination.
Use of the Engineering Menu for Calibration
For a deeper setup, the Xiaomi Redmi 8 Pro provides access to an engineering menu hidden from ordinary users, which allows you to test hardware components and perform initial calibration of the microphone, accessed through a special code entered in the Phone application.
Enter the combination ##6484## in the dialing field, and the CIT menu will open, where you will find a list of all the modules you are testing, and find items related to Main Mic and Sub Mic.
##6484##If you choose a microphone test, you'll hear a sound or see a wave visualization if the device is working properly. Speak to the microphone and watch the indicator for reaction. If the strips are not moving or moving very weakly, it may indicate that the component needs to be replaced or it is seriously contaminated.
- 🛠️ Select Audio or Mic from the Engineering Menu.
- 🗣️ Speak to the bottom and top microphone in turn, checking the recording.
- 📉 Pay attention to the signal level: it should be stable without sudden jumps.
In some cases, automatic calibration is available, but you should use it with caution. Incorrect calibration can cause the microphone to work even quieter. It is better to simply conduct a diagnosis to make sure that the hardware is working before software edits.
☑️ Diagnostics in the engineering menu
Setup of permissions for applications
Often the problem lies not in the system, but in the fact that a particular application (for example, WhatsApp, Telegram or other applications) is not a problem. VK) He doesn't have access to the microphone or he doesn't use it properly. MIUI Implemented a strict privacy control system that requires explicit permission for each application.
Go to the app settings and find the permission list, make sure the messengers you want are ticked against the microphone, and if access is denied, the app simply won't be able to transmit your voice, even if the system settings are perfect.
| Annex | Status of access | Recommendation |
|---|---|---|
| Permitted. | Check the settings inside the application | |
| Telegram | Forbidden. | Enable access in the MIUI settings |
| Dictaphone | Permitted. | Used for testing |
| Skype | Ask. | Establish permanent authorization |
It’s also worth checking your power saving settings. Xiaomi’s aggressive charge saving mode can block the microphone from running in the background apps. Add important messengers to the exclusion list or set a “No Limits” strategy for them to ensure stable communication.
⚠️ Attention: After system update MIUI Application permissions can be reset. Always check them again after the firmware update.
Cleaning and physical maintenance of the microphone
The physical condition of the microphone holes is a critical factor that is often ignored, and over time, the speaker's grid is filled with dust, skin fat and pile from his pockets, creating a dense plug that silences the sound before it even hits the microphone membrane.
Use a soft toothbrush or a special sticky electronics tape to clean the microphone, and it is strongly advised not to blow into the microphone with your mouth, as saliva can get inside and damage contacts, or use sharp objects that can pierce the protective net.
- 🧹 Carefully walk with a dry soft brush on the microphone holes.
- 🧴 Use the minimum amount of isopropyl alcohol on a cotton swab for degreasing.
- 🌬️ You can use a spray of compressed air, but keep it at least 10 cm away.
If your Xiaomi Redmi 8 Pro has moisture protection, be especially careful with liquids.Even safe alcohol can damage the oleophobic coating or adhesive joints if you pour too much of it.It is better to clean when the device is turned off.
Can I take down the phone to clean?
Third-party applications for sound management
If standard tools are not enough, specialized applications from the Google Play Store come to the rescue, allowing you to amplify the signal, adjust the equalizer and apply various noise filters, but it is worth remembering that third-party software has access to your data and can consume battery resources.
One of the popular solutions is the Precise Volume or Volume Control Plus app, which allows you to create sound profiles for different situations, for example, you can create a Conversation profile, where the sensitivity of the microphone is twisted to the maximum, and noise cancellation is minimized.
When using such tools, it is important not to overdo it. Excessive amplification (Gain) will lead to severe distortions and wheezing that will make conversation impossible, and the setting should be done by trial and error, checking the result on the real interlocutor.
💡
Use the Dictophone app to record test pieces after each setup, which will allow you to objectively evaluate changes without being distracted by live dialogue.
Solving noise reduction problems
The noise reduction system in the Xiaomi Redmi 8 Pro uses two microphones: the main one (bottom) and the secondary one (top or back). The algorithm compares signals and subtracts background noise. If one of the microphones is not working correctly, the system can start cutting your voice, mistaking it for noise.
To check the secondary microphone, turn on the video and cover the bottom hole with your hand. Speak to the top hole. Then change the conditions. If in one case the sound disappears completely or becomes very quiet, then the corresponding microphone is defective.
In some cases, resetting the network and sound to the factory helps, bringing the noise reduction algorithms back to their original state, removing any software errors accumulated during use, but this will require reconfiguring Bluetooth headsets and Wi-Fi networks.
💡
The quality of communication on Xiaomi Redmi 8 Pro directly depends on the synchronous operation of both microphones. The failure of one of them breaks the noise reduction algorithm.