How to increase volume on Xiaomi Redmi Note 9 Pro: all ways from simple to complex

Xiaomi Redmi Note 9 Pro is one of the most popular mid-range smartphones, but many users are faced with the problem of not loud enough, especially when listening to music through external speakers, while calling or watching videos without headphones. In this article, we will discuss all possible ways to increase the volume, from standard settings to hidden functions of the engineering menu and third-party applications.

It's important to understand that volume limits are often set by the manufacturer for a reason: too high a sound level can damage the speakers or impair the quality of the playback, but if you're sure you want to take a risk, our instructions will help make the sound noticeably louder without losing quality, starting with the safest methods and gradually moving to more radical ones.

1. Checking basic volume settings

Before you resort to complex manipulations, make sure that the problem is not the basic settings. The Redmi Note 9 Pro has several independent volume controllers that users often confuse:

• 🔔 Call and notifications – adjusts the volume of incoming calls, SMS and app alerts.
• 🎵 Media – is responsible for the volume of music, videos, games and other multimedia files.
• 📞 Conversation – controls the volume of the interlocutor’s voice during the call.
• 🔊 System sounds – turns on/off the sounds of pressing, locking the screen, etc.

To check all the parameters, follow the following steps:

1. Press the physical volume button on the side panel of the smartphone.
2. Touch the badge. ⚙️ (gear) next to the volume slider.
3. In the menu that opens, adjust each parameter separately.

Also make sure that the smartphone does not activate Do Not Disturb mode (Settings → Notifications and Status bar → Do Not Disturb).In some cases, it can automatically turn down the volume or turn off the sound completely.

⚠️ Warning: If the volume is still low after the settings change, the problem may be physical damage to the speakers or headphone jack.

2. Enable the "Sound Amplifier" mode in MIUI

MIUI firmware (especially versions 12 and above) has a hidden feature called "Sound Amplifier" that can increase the volume by 10-15%, activated through the developer's settings, but you need to turn them on first:

1. Go to Settings. → The phone.
2. Click on MIUI Version 7 times in a row until the notification “You are a developer!” appears.
3. Return to the main settings menu and select Additional → For developers.
4. Find the option “Sound Amplifier” (or “Disable Absolute Volume” in English) and activate it.

Once activated, restart your smartphone, and you'll notice the effect of playing music through speakers or connected headphones. Note that some versions of MIUI may not have this option, depending on the regional firmware.

If there is no audio amplifier option, try an alternative method:

1. Connect the headphones to your smartphone.
2. Play any audio (such as music in Mi Music).
3. Hold the volume button until the maximum level warning appears.
4. Press OK in the warning – sometimes this will unlock the extra volume.

3.Use of the engineering menu (for advanced users)

The Engineering Mode allows you to fine-tune the sound parameters, including amplifying the signal on the speakers. This method requires caution: the wrong settings can lead to distortion of the sound or damage to the speakers.

To open the engineering menu:

1. Open the Phone app.
2. Enter the combination: ##36446337## (or #4636## for the alternative menu).
3. Choose Hardware Testing → Audio.

In the Audio menu, pay attention to the following parameters:

• 🔊 Speaker Mode – Testing of external speaker.
• 🎧 Headset Mode – settings for headphones.
• 📞 Receiver Mode – Volume of Speaking Speaker.
• 🔄 Loopback – check the sound chain (do not change!).

To increase the volume:

1. Select Speaker Mode (for external speakers) or Headset Mode (for headphones).
2. In the Value field, increase the value by 5-10 units (maximum 160, but it is not recommended to put above 140).
3. Press Set, then check the sound.

⚠️ Warning: If you have wheezing or distortion after a change in the engineering menu, immediately return the values to the original!

4.Apps to amplify the sound from Google Play

If the system methods didn't work, we could use third-party utilities, and we tested a few applications and selected the most effective and safe ones:

The easiest option is the Volume Booster.

1. Open the app and accept the warning.
2. Move the slider 120-130% (above is the risk of distortion).
3. Activate the Apply on Boot option to save the settings after the reboot.

For audiophiles, ViPER4Android is the best choice, but installing it requires additional steps:

Download APK from the official website |Install Magisk (if no root) |Activate the driver in the application settings |Select the ViPER4Android FX profile in the audio settings-->

Note that some applications (e.g. ViPER4Android) may conflict with MIUI system sound drivers. If you have problems with sound after installation, uninstall the application and restart the smartphone.

Verification and cleaning of speakers

Low volume isn't always about software settings. Often the problem is physical contamination of the speakers. On the Redmi Note 9 Pro, the external speaker is located on the bottom end panel and is easily clogged with dust, villi or particles from your pocket.

To clean the speaker:

1. Turn off your smartphone.
2. Take a soft toothbrush (preferably a new one) and walk gently through the speaker grille.
3. Use a spray of compressed air (for example, to clean keyboards) to blow out dust.
4. Do not use sharp objects (needles, toothpicks) - they can damage the speaker membrane.

If the sound does not improve after cleaning, check the speaker for physical damage:

• 🔍 Examine the grate for dents or cracks.
• 🎵 Turn on music and put your finger on the speaker – if the vibration is weak or absent, a malfunction is possible.
• 🔊 Compare volume to another device (e.g. headphones) – if the difference is significant, the problem is dynamics.

⚠️ Warning: If the speaker wheezes or cracks even at a low volume, it is a sign of mechanical damage, in which case increasing the volume by software methods will only aggravate the problem.

💡

To check the performance of speakers, use test audio files with a frequency of 1000 Hz. These can be found on YouTube or specialized sites.

6. Adjust audio via ADB (for power users)

If standard methods don’t work, you can try changing the system’s sound settings via Android Debug Bridge (ADB), which requires connecting your smartphone to your computer and basic command line knowledge.

First, prepare everything you need:

• 🖥️ A computer with installed Xiaomi drivers and ADB.
• 📱 Included debugging by USB on a smartphone (Settings) → For developers → Debugging by USB).
• 🔌 Cable USB (preferably original).

Next, execute the following commands in the terminal (command line):

adb shell


su




settings put global volume_steps 30




settings put global volume_music_steps 30




settings put global volume_voice_steps 15




settings put global volume_system_steps 15




settings put global volume_alarm_steps 15




settings put global volume_notification_steps 15




settings put global volume_bluetooth_sco_steps 15

These commands increase the number of volume control steps, which allows you to fine-tune the sound level. After you do this, restart your smartphone.

For more radical amplification, you can change the parameters of the sound mixer:

adb shell


su




tinyalsa_mixer 'Speaker Playback Volume' 140




tinyalsa_mixer 'Headphone Playback Volume' 140

Warning: changing the mixer parameters can overload the speakers. Values above 140 are not recommended!

💡

Use ADB only if you are confident in your actions. Incorrect commands can cause a system crash or loss of sound completely.

7.Alternative methods: from headphones to external speakers

If all of the above methods did not give the desired result, consider alternative options:

• 🎧 Headphones with strengthening bass - models with impedance 16-32 Oms (like Xiaomi Hybrid Pro) often sound louder than built-in speakers.
• 🔊 Portable Bluetooth speakers – even budget models (like the Xiaomi Mi Portable Speaker) will provide more powerful sound.
• 🔌 Outside USB-C amplifier – connects through the Type-C connector and amplifies the signal for headphones.
• 📱 Passive amplification cases – some models of covers have special cutouts that direct the sound forward.

If you want to be loud when calling, try:

• Using a headset with a microphone will not only enhance the sound, but also improve the quality of voice transmission.
• Activate hands-free mode during a conversation (button with the speaker image in the call interface).
• Check the quality of the connection – sometimes low volume is associated with a bad signal network.

For music lovers, a good solution is to buy a Bluetooth adapter with amplification of sound, such devices (for example, Fiio BTR3) connect to a smartphone via Bluetooth, and headphones to the adapter over a wire, which allows you to bypass the volume limits imposed on the smartphone.

FAQ: Frequently Asked Questions