Owners of the Redmi 8 smartphone often face a situation where the standard volume of the conversational speaker becomes insufficient. This can occur in noisy places, on the street in high winds or simply over time, when the user’s hearing aid requires a more powerful signal. The device released by Xiaomi has decent characteristics, but the software limitations of regional versions of the firmware sometimes do not allow you to squeeze the maximum out of the speaker.
There are several proven ways to amplify the sound without having to disassemble the gadget or carry it to a service center. We'll look at both the standard Android operating system and the MIUI shell, and more advanced methods through the engineering menu. It's important to understand that software amplification has its physical limits, depending on the quality of the dynamic emitter itself.
Before you start taking any drastic measures, you should rule out the banal reasons for the quiet sound, check whether the speaker hole in the upper part of the case is covered with a protective film or a cover, and also make sure that the mesh is not clogged with dust, pile from the pocket or earwax, which is a common cause of a 30-40% decrease in volume.
The first and safest step is to carefully check the basic settings of your Redmi 8. Often users overlook that the media volume and the call volume are adjusted separately. During an incoming or outgoing call, press the side volume button and make sure that the slider is raised to the maximum value for the “Call” category.
MIUI also has advanced audio settings that can significantly affect perceived volume. Go to Settings → Sound and Vibration → Sound Effects. This is the equalizer, which by default can be turned off or set to a mode not suitable for voice communication. Try activating preset Loud or manually lifting high- and medium-frequency sliders.
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In the Sound Effects section, enable the Mi Sound Enhancer feature, which automatically analyzes the content you play and optimizes the audio stream, making the speaker's speech more legible and louder.
Notice the Mono audio feature, which is sometimes randomly enabled in the special features section. If it's active, the stereo is combined into a single channel, which can change the sound pattern and subjectively lower the volume. Disabling this option will return the channel balance, although it's less critical for a conversational speaker than for headphones.
One of the most effective methods for power users is to log into the engineering menu, which is a hidden part of the system that's designed for testing equipment by plant engineers, where you can directly control the amplification of audio channels, and be very careful: changing unknown parameters can lead to unstable operation of the device.
To enter the engineering menu on Redmi 8, open the Phone app and enter the combination ##3646633##. If the menu doesn't open, your firmware version may be blocking this code, so you can try downloading the Engineering Mode app from the Google Play store, although it's not guaranteed to work on new versions of Android.
After you log in, go to the Hardware Testing tab, then select Audio → Audio Debugging. You are interested in the Normal Mode section, not the headset or hands-free mode. In the list of types, select Sph (Speech is a conversational speaker), you will see level sliders (Level) and digital gain (Digital Gain). Increasing the value of Digital Gain by 2-4 units can give a noticeable increase in volume.
Risks of changing the settings in the engineering menu
⚠️ Warning: Do not reset settings in the Set Default menu unnecessarily unless you are sure you will return them back. Write down the initial values before making changes so you can roll back.
Sound quality is often affected by the state of the software. Xiaomi regularly releases updates that may contain bug fixes for audio drivers. Check for updates in the Settings menu → About Phone → MIUI version.
Sometimes the problem isn't with the system, but with a specific calling app. Google's standard Phone app or MIUI Dialer may conflict with other installed programs. Try clearing the Phone app's cache through the Settings menu → Apps → All Apps → Phone → Memory → Clear.
☑️ Diagnostics of programme problems
If you've installed third-party launchers or call recording apps, try temporarily removing them. Some of them intercept the audio stream and may mishandle volume levels by lowering them. In Safe Mode (loaded by pressing the off button on the lock screen), third-party apps don't work, allowing you to know if third-party software is to blame.
The physical condition of the device is crucial. If your Redmi 8 is a few years old, the speaker membrane may have become tired or degraded, and it is also a common problem to oxidize the contacts or get moisture, even in microscopic amounts.
Try to clean the speaker mesh carefully. Use a soft toothbrush or dry brush. You can use a special sticky tape (cleaning gel), but do not pour alcohol or water under pressure. The "warm-up" method (carefully warmed up with a hair dryer at a minimum temperature for 30 seconds) sometimes helps to evaporate micro-moisture, but requires great care.
| Problem. | Symptoms. | Possible solution |
|---|---|---|
| Grid contamination | The sound is deaf, quiet, hissing. | Brushing or gelling |
| Failure of the | Volume jumps or disappears after update | Resetting or flashing |
| Dynamic wear and tear | Constant crackling, wheezing at maximum | Replacement of module in the service |
| Outsider | Silent sound only in certain applications | Removal of conflicting programmes |
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If after cleaning and software settings the sound remains quiet and hoarse, most likely, a physical replacement of the speaker is required, since its resource could be exhausted.
There are specialized applications from the Google Play store that allow you to amplify sound programmatically, bypassing system constraints, such as Volume Booster GOODEV or Precise Volume, which create a virtual amplification layer on top of the system sound.
Using these programs on Redmi 8 requires caution, which can amplify not only the signal, but also background noise, making the conversation unpleasant, and the constant use of maximum amplification by third-party utilities puts an increased load on the audio chip.
When installing these applications, carefully read permissions. Many of them require access to system audio settings. If the application requests access to contacts or SMS, it is better to refuse to use it for the sake of security of your data.