Owners of budget and mid-budget smartphones often face a situation where standard media volume or conversational speaker is not enough in noisy conditions. Xiaomi Redmi 9, despite its advantages, is not without typical for its price segment limits on the power of the audio path, but this does not mean that you need to put up with a quiet sound while watching a video or talking.
There are many proven ways to get the most out of a device, and we'll look at both the software methods for configuring the MIUI system and the more advanced ones using an engineering menu and third-party software, and it's important to understand that not all methods work equally for every user, so it's worth trying them consistently.
In this article, you will find a detailed guide to amplifying sound, we will break down the hidden settings that are often overlooked, and explain how to safely raise the signal level without risking damage to the hardware of the gadget.
Basic sound and multimedia setting
The first thing to do is to eliminate the trivial causes of quiet sound, and users often forget to check if the minimum volume is set in the particular app they are currently using. Android separates the volume levels for calls, notifications and media, and adjusts them separately.
Go to the basic settings of your Redmi 9 and find the Sound and Vibration section, where you can not only set the maximum value with sliders, but also activate additional options. For example, enabling Adaptive Sound can automatically adjust the frequency balance to the surrounding environment, which subjectively makes the sound louder and cleaner.
You should also look at the Dolby Atmos settings, if available in your firmware version. This surround sound algorithm can significantly improve the perception of the audio stream. From the equalizer menu, choose a profile of Music or Video, or create your own, lifting all the frequency sliders upwards, but avoiding wheezing.
- 🔊 Check the physical volume button while playing a video to adjust the media track, not the call.
- 🎛️ Enable the option “Mi Sound Enhancer” in the sound settings to improve detail.
- 📢 Make sure that in the “Do Not Disturb” mode there is no limit on the maximum volume of the alarm clock.
Remember that some video files or music tracks may initially be recorded at low volume, and in such cases, system settings may not give the desired effect, and you will need to use third-party players with amplification.
Cleaning of speakers and elimination of physical interference
Before you go into the deepest settings, you should make sure that the device is physically healthy. Over time, dust, pile from clothes and small debris accumulate in the speaker grid of Xiaomi Redmi 9, which creates a natural barrier to the sound wave, which makes the sound quiet and deaf.
You can use a soft toothbrush or a special sticky electronics tape to clean the teeth, walk through the speakers' holes carefully, trying not to damage the safety net, and an effective method is to use a speaker cleaning app that generates sound waves of a certain frequency that push the dust out.
⚠️ Warning: Never use sharp objects (needles, pins) to pick through the speaker. You can pierce the speaker membrane, which will lead to irreversible deterioration of the sound quality or its complete disappearance.
If the sound isn't getting better after cleaning, check to see if the phone is wearing a case that covers the output holes. Some silicone bumpers have too narrow slots that partially silence the sound. Remove the case and check the volume again.
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Use the "Clean Speaker" feature in Xiaomi's "Security" app. It plays high-frequency sound, which helps shake dust out of the grid.
Using an engineering menu to amplify sound
One of the most effective ways to increase volume on Redmi 9 is to edit parameters through the engineering menu, which is a hidden part of the system designed for testing equipment by engineers, where you can manually raise volume limits for different use cases.
To enter the engineering menu, open the Phone app and type in the combination ##3646633##. If the standard code doesn't work on your version of MIUI, try installing the MTK Engineering Mode app from the Play Market, as Redmi 9 is built on the MediaTek platform. From the menu that opens, go to the Hardware Testing → Audio → Audio Debugger tab.
Inside the menu, you'll see a list of profiles (Normal Mode, Headset Mode, etc.) Select Normal Mode and then Media. Here you're interested in the Digital Gain setting. Increase it gradually (e.g., from 130 to 160), but don't set the maximum value right away so as not to disrupt the speaker.
| Parameter | Description | Recommended value | Risk |
|---|---|---|---|
| Digital Gain | Digital signal amplification | 150-170 | Medium (possible wheezing) |
| Max Vol Step | Maximum step of volume | 14-15 | Low. |
| Speech Gain | Enhancing the conversational dynamics | By default. | Tall (echo) |
| Ring Gain | Loudness of the call | 160 | Low. |
What to do if the menu does not open?
After making changes, be sure to press Set or Refresh to make the settings apply. Restart your phone and check the result. If the sound is too distorted, return the values back.
Third-party amplifiers
If there is not enough built-in tools, specialized applications from the Google Play store come to the rescue, and they work as software equalizers with Pre-amp function, such programs can raise volume above the system limit of 100%.
One popular solution is the Volume Booster GOODEV app, which is easy to use: after installation, you just need to move the Boost slider to the desired value. However, be careful: setting a value above 40-50% can lead to overloading of the speaker.
- 📈 Volume Booster is a simple interface that allows you to amplify the sound up to 60%.
- 🎚️ Bass Booster – not only increases volume, but also adds low frequencies.
- 🔊 Super Volume Booster – has presets for different types of content (movies, music).
⚠️ Attention: Long-term use of amplifiers at maximum power can cause the sound chip to overheat and eventual speaker failure.
☑️ Safe use of boosters
Many modern players, such as VLC for Android or Poweramp, have built-in amplifiers. If you watch movies or listen to music through them, setting up (Gain) within the application itself often gives a better and better result than global system boosters.
Setting up Bluetooth devices and headsets
The problem of quiet sound often occurs when connecting Xiaomi Redmi 9 to Bluetooth headsets or speakers, in which case the settings of the phone itself may conflict with the settings of the connected device. First of all, check the volume on the external device itself, as it is independently adjustable.
In your phone settings, go to the "Bluetooth" section, find the connected device, and click on the gear icon next to it. Make sure the Media Audio switch is active. Also in some versions. MIUI There is a hidden option “Absolute Volume Level” that you can try switching in the engineering menu or through the ADB-commands to synchronize sliders.
If the sound in the headphones is still quiet, try turning off the Adaptive Sound function or any Dolby Atmos effects, as they may not work properly with external DACs. Sometimes it helps to reconnect the device or remove the pairing profile and create a new one.