How to increase volume in Xiaomi Redmi Note 9 Pro: The complete guide

Xiaomi’s Redmi Note series has always been known for its excellent value for money, but multimedia capabilities, such as the audio system, are often criticized by demanding users. Owners of the Redmi Note 9 Pro often face a situation where the maximum standard volume is not enough to comfortably listen to music in noisy places or watch videos in poor acoustic conditions. Standard Android settings and MIUI shells by default limit the power output to protect speakers from overload and wheezing, but these restrictions can be avoided.

In this article, we will take a look at all the available methods for amplifying sound, from basic system settings to the use of hidden engineering menus and third-party software. You will learn how to properly configure the equalizer, which applications are really effective and which can harm the hardware of your device. It is important to understand that software volume increase is always a compromise between sound level and quality, so you need to approach the issue wisely.

Before we go to radical measures, we need to eliminate trivial software failures or physical obstacles. Sometimes the problem is not the lack of power of the amplifier, but the wrong sound profile or even the contamination of the dynamic grille. We will look at each aspect in a comprehensive manner so that you can choose the most suitable for your use scenario.

Basic setup of multimedia and calls in MIUI

The first step should always be to carefully check the standard settings, as the MIUI shell provides users with a wide range of tools to manage audio that is often ignored. In the Android system, and in particular in its modifications from Xiaomi, the volume levels are divided into independent channels: media, call, alarm and notifications. Make sure that the media content slider is twisted to the maximum not only through the sidebar, but also in deep system settings.

To access the advanced sound settings, go to Settings → Sound and Vibration → Sound Effects. This is a built-in graphical equalizer that allows you not only to change the timbre, but also to choose presets. To maximize volume, it is often recommended to choose a Rock or Pop profile, as they have a more aggressive frequency gain curve by default compared to Normal or Jazz mode.

⚠️ Warning: Excessively raising high frequencies in the equalizer can lead to unpleasant whistling sounds and rapid wear of the high-frequency speaker.

Also worth paying attention to is the Dolby Atmos feature, if available in your firmware version. Activating this mode can significantly improve spatial sound and subjectively increase volume through more efficient frequency allocation. However, in some cases, turning on Dolby Atmos at the highest volume causes dynamic range compression, making the sound quieter, so experiment with turning this option on and off.

• 🔊 Check if Do Not Disturb mode is activated, which may limit sound notifications.
• 🎚️ In the equalizer settings, manually lift all frequency sliders upwards, creating a flat or slightly ascending curve.
• 📞 Separately check the volume of the speaker during the test call using the adjustment buttons.
• 🎧 Make sure that there is no absolute volume limit in Bluetooth settings if you use wireless headphones.

⚠️ Note: When using wired headphones, make sure there is no dust in the 3.5mm connector, as contact oxidation can reduce the transmitted signal.

Remember that the quality of the source file also plays a role. Low-bitrate tracks from streaming services can sound worse when maximized than quality FLAC or WAV files. If you stream music, try setting the player application (for example, Spotify or Yandex.Music) to set the maximum quality of playback.

Using an engineering menu to amplify sound

One of the most effective, but also the most risky ways to increase volume is to use the MTK (MediaTek) engineering menu, since the Redmi Note 9 Pro is based on the Snapdragon processor, but some regional firmware or modifications may contain tools specific to other platforms or universal codes. However, for Qualcomm processors that are in this model, the use of code # #3646633# (if supported by firmware) or specialized application-entry for engineering mode is more relevant.

If your phone is logged in to an engineering menu, you'll need to find the Audio → Audio Debug section. Here's the settings for different scenarios: Headset, Handfree, and Receiver, and we're interested in a tab that matches your use case. Inside, you'll see a volume table (Level 0-6), and that's where you can force up the gain values for each level.

The process of tuning is as follows: select the desired level (for example, Level 6 for maximum volume), then increase the value in the Digital Gain or Vol field. Standard values are usually in the range of 120-140. Increase to 150-160 can give a noticeable increase, but further increase is guaranteed to lead to distortion.

In this case, this method is only applicable on devices with Root rights and installed special modules that allow access to system partitions. Without root rights, the ability is limited to only viewing certain parameters, unless the manufacturer has blocked access completely.

• 🛠️ Use the code dialer to enter ##3646633## (not working on all firmware).
• 📉 Do not raise the value more than by 10-15% from the factory, so as not to burn the coil of the speaker.
• 💾 Make sure to take a screenshot or photo of the screen with the original numbers before changing.
• 🔄 After settings (Set) are applied, the device must be restarted to take effect.

Application of third-party amplifiers

If system methods and engineering menus are unavailable or seem too complex, Google Play Store apps designed specifically for software-based audio pumping come to the rescue. API Android to increase the (gain) audio stream before sending it to the DAC. Leaders in this niche are applications like Volume Booster GOODEV, Super Volume Booster and its analogues.

When you first run an app, you'll see a gain slider. The optimal and safe value for daily use is the range from 20% to 40%. Exceeding the mark of 50-60% in most cases leads to a catastrophic deterioration in quality: the sound becomes porridgeous, strong wheezing and clipping appear.

Many amplifiers offer additional features such as equalizer, bass booster and normalizer. Using a Loudness Normalization is often more effective than a simple boost, as it aligns the volume of quiet tracks to the level of loud tracks without causing overloads. It is also worth paying attention to applications with the Boost function at launch, which automatically activate the amplification when you open a media player.

Note that running such programs in the background can consume additional battery power and processor resources. Some Xiaomi models can aggressively kill such applications to save energy, so they need to be added to the battery exception list (Settings → Battery → Application Management) and allow auto-run.

• 📱 Appendix Volume Booster GOODEV It is considered one of the most stable and easy to use.
• 🎚️ Do not turn on the booster at maximum (100%), this is a direct way to break the speaker.
• 🔋 Watch out for smartphone heat as sound amplification increases load on audio chip.
• 🚫 Avoid intrusive advertising apps that can slow down the system.

Audio modifications for users with Root rights

For advanced users who have been granted superuser (Root) rights through Magisk, entirely new audio customization horizons open up: System modifiers allow you to interfere with the audio driver at a deep level, bypass-i standard Android restrictions. One of the most popular and powerful tools is the Viper4Android module (and its forks, such as the Viper4Android FX).

Once the module and driver are installed, the system can fine-tune the audio path. Master Limit allows you to raise the volume limit above the standard, and Dynamic Boost intelligently enhances quiet areas of the track. Unlike simple boosters, Viper4Android operates at the kernel level, which provides minimal delays and high processing quality.

Another powerful tool is the MiSound Enhancer module, designed specifically for Xiaomi devices, which unlocks hidden settings of the sound chip, allowing you to activate additional profiles and increase power output. Installing such modules requires an unlocked bootloader, which automatically deprives the device of warranty and can affect the operation of banking applications (although this is bypassed through Magisk Hide).

💡

Before installing any system modules, be sure to make a full data backup and create a restore point in TWRP Recovery to be able to roll back changes in the case of a brick.

It is also worth mentioning the possibility of replacing system sound configuration files (for example, the system is not a good idea, mixer_paths.xml). Enthusiasts create modified versions of these files, where the gain for a particular codec is changed. Installing such a file requires knowledge of the Android file system and understanding the structure of the Qualcomm audio subsystem.

• 🔓 Root query gives full control of the audio system, but require caution.
• 🎛️ Viper4Android Offers the best sound processing quality among all available solutions.
• ⚙️ Magisk modules do not require systemless partitioning, which makes it easier to delete.
• 📉 Modifying system files can cause loss of sound if the file is not compatible with your Android version.

Physical Causes of Silent Sound and Their Removal

Before you blame the software, you should rule out physical factors that often cause quiet sound. The main speaker in the Redmi Note 9 Pro is located at the bottom of the case, next to the charging port. This place is subject to a constant accumulation of dust, pile from pockets and small debris, which over time tightly clogs the speaker grid, physically blocking the output of the sound wave.

You can use a soft toothbrush to clean, gently walking on the grid, and a more effective but careful method is to use ultrasonic cleaning or compressed air purging (at a minimum power so as not to damage the membrane), and you can use a special sticky tape (gel cleaner), which pulls dirt from the pores of the grate.

Another physical cause could be a poor-quality case. Some protective cases, especially those not specifically designed for the Redmi Note 9 Pro, can cover part of the speaker hole or create a resonant camera that dampens the sound. Remove the case and check if the volume changes.

If the phone fell, the plume that connects the main board to the speaker module could move away, in which case the sound may disappear completely or only appear at a certain position of the device, a problem that is solved only in the service center by reconnecting the plume or changing the speaker.

Configure Bluetooth devices and codecs

If the volume problem is relevant when connecting wireless headphones or speakers, the reason may lie in the data protocols. Redmi Note 9 Pro supports Bluetooth 5.0, but the sound quality depends on the chosen codec. Codecs like SBC are of lower quality and can sound quieter than aptX, aptX HD or LDAC.

Check and change the codec from the developer menu. To activate this menu, you need to quickly click 7 times on the MIUI version in About Phone. Then in Advanced Settings → For developers, find the Bluetooth Codec. Switching to a better codec (if your headphones support it) can improve detail and subjective volume.

💡

Using the aptX Adaptive codec or LDAC allows you to transfer more data, which makes the sound richer and louder compared to a standard SBC.

There's also an option on the developer menu to turn off absolute volume. Try to change the state (turn it on or off), and in some cases, desynchronizing the phone's volume sliders and headphones causes the system to limit output, believing that the device is not yet at its maximum, a parameter that often solves the problem.

• 🎧 Make sure the headphones are charged, as when the charge is low, some models turn down the volume.
• 🔗 Reconnect your Bluetooth device to reconcile profiles.
• 📱 Check whether the volume limit in the settings of the headphones themselves is worth it (if there is a companion app).
• 📡 Stay close to the source of the signal to avoid transmission losses.

Comparative table of reinforcement methods

To make it easier for you to choose the right method, we have systematized the methods we have reviewed according to their effectiveness, complexity and safety. Each method has its advantages and disadvantages, and the choice depends on your willingness to take risks and technical skills.

As you can see from the table, root-right software methods are the most advanced, but require deep knowledge. For most users, the best option is a combination of high-quality speaker cleaning, equalizer settings, and moderate use of a booster application.

Frequently Asked Questions (FAQ)