How to increase volume on Xiaomi Redmi Note 9 Pro: from standard settings to engineering menu

Xiaomi Redmi Note 9 Pro is one of the most popular mid-range smartphones, but many users face the problem of not loud enough speakers, especially in noisy conditions or when listening to music through built-in speakers. Unlike flagship models, where the sound is more carefully worked out, budget devices often save on the audio system. However, this does not mean that you are doomed to quiet sound: MIUI and hardware Redmi Note 9 Pro have hidden reserves that can be used.

In this article, we’ll look at 7 proven ways to turn up the volume, from basic settings in the phone menu to advanced methods using engineering menus and third-party apps. It’s important to understand that some methods can affect sound quality or even speaker life, so we’ll point out all the risks and limitations. If you’re willing to experiment, let’s get started!

1. Standard volume settings in MIUI

Before resorting to drastic measures, check the basic sound settings in MIUI firmware. The Redmi Note 9 Pro has a few built-in regulators that many users overlook.

Open Settings → Sound and vibration. The following options are available here:

• 🔊 Multimedia Volume: regulates sound in games, videos and music. Make sure the slider is exposed to maximum.
• 📞 Call volume is a separate regulator for incoming calls, and users often increase the media, but forget about this parameter.
• 🔔 Loudness of notifications – affects the sounds of messages and system alerts.
• 🎧 Headphone volume – if you use wired or Bluetooth headphones, check this slider.

Note the option Adaptive Sound (if your version of MIUI has one), which automatically adjusts the volume to the surrounding environment, but sometimes it doesn’t work correctly – try turning it off if the sound seems too quiet.

⚠️ Note: In some versions MIUI When you update, you reset the volume settings for individual apps (like YouTube or Spotify) and check the volume directly in the app itself, often with a system-independent regulator.

Activation of the "Sound amplifier" mode" (MI Sound Enhancer)

The Redmi Note 9 Pro features MI Sound Enhancer, which improves the sound of speakers through software processing, which is hidden in the settings and disabled by default.

To activate it:

1. Go to Settings → Sound and vibration → Sound quality.
2. Find the MI Sound Enhancer option (some firmware may call it a Sound Amplifier or Sound Effects).
3. Turn on the slider and select the Speaker or Music profile.
4. Experiment with equalizer settings – increasing low and medium frequencies visually adds volume.

This function works best when listening to music or watching videos. For calls and notifications, the effect is minimal. If the sound becomes distorted after turning on (wheezing or crackling), reduce the amplification level or turn off the function.

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If your MIUI version doesn’t have the MI Sound Enhancer option, try upgrading to the latest stable version, which is not available in some regional builds.

3.Use of the Engineering Menu (MTK Engineer Mode)

For advanced users, there is a way to increase the volume through the Mediatek engineering menu (Redmi Note 9 Pro chipset – Helio G95), which allows you to manually adjust the parameters of the audio amplifier, but you need to be careful.

Instructions:

1. Open the Phone app and enter the combination ##36446337## (or #4636## → go to Hardware Testing → Audio).
2. Select LoudSpeaker Mode (or Speaker).
3. In the Max Vol or Volume section, increase the value to 150 or 160 (usually 128).
4. Save the settings and restart the phone.

⚠️ Warning: An increase above 160 can cause the speakers to be damaged due to overload. If there is a distortion after the change or the phone starts warming, return the settings to the factory settings.

If the engineering menu doesn't open through the code, try installing the MTK Engineering Mode app from Google Play, which has the same settings, but with a more user-friendly interface.

Record the current parameter values|Use the charger (do not allow discharge during changes)|Not exceeding 160 times Max Vol.|Check the sound after each change.-->

4. Equalizer setting and third-party applications

If the built-in MIUI tools don't work, you can use third-party apps to amplify the sound.

To install ViPER4Android on Redmi Note 9 Pro without root rights:

1. Download APK from the official website (for example, viperatmos.com).
2. Install the ViPER4Android FX app and driver.
3. Select the Headphone or Speaker profile.
4. Activate ViPER Bass and ViPER Clarity options to amplify low and medium frequencies.

If the sound is gone or robotic after installing the app, restart your phone and check the default settings in ViPER4Android.

5. Cleaning of speakers from dust and debris

Often, the silent sound is not caused by settings, but by physical contamination of the speakers. In the Redmi Note 9 Pro, the lower speaker connector is located next to the USB-C connector, where dust, pile or even small debris easily gets into.

How to clean the speakers:

• 🧹 Use a soft brush (for example, for drawing) or a toothpick wrapped in cotton. Carefully remove visible particles from the speaker's grille.
• 💨 Use a compressed air can (sold in electronics stores) and hold the balloon vertically and blow the holes with short presses.
• 🔊 To check the sound after cleaning, use the test: turn on the music at maximum volume and put your finger on the speaker - if the vibration has become stronger, then the pollution was the cause of the quiet sound.

⚠️ Warning: Do not use sharp objects (needles, knives) to clean - this can damage the speaker membrane. Also avoid liquids: even a drop of water can cause corrosion of contacts.

If the sound hasn't improved after cleaning, it's probably a hardware problem (detached contact, damaged membrane), and only a service center will help.

6. Update firmware and reset settings

Sometimes the cause of quiet sound is software failures in MIUI. For example, after updating the firmware, audio settings may reset or drivers may appear bugs.

What to do:

• 🔄 Check for updates: Settings → The phone. → Update system. Install the latest stable version MIUI.
• 📱 Reset the sound settings: Settings → Annexes → Application management → Settings (⚙️) → Resetting application settings.
• 🔧 If the problem persists, make a soft reset (without data loss): Settings → Additionally. → Resetting settings → Resetting all settings.

After reset, check the volume again. If the sound is normal, it means the problem was in the settings conflict. If not, you may need a full factory reset (but back up the data before you do that!).

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Before resetting, make sure to check if the phone has third-party audio management apps (like Volume Booster) that may conflict with system settings.

7. Hardware modifications (for experienced users)

If the software doesn't work, then there's hardware intervention, which is an extreme method that requires soldering skills and an understanding of electronics. In the Redmi Note 9 Pro, you can:

• 🔧 Replace the speakers with more powerful ones (for example, from the Redmi Note 10 Pro - they are compatible on connectors).
• 🔋 Enhance the power of the audio amplifier by modifying the board (requires circuitry and experience with a soldering iron).
• 🛠️ Add an external amplifier through the connector USB-C (DragonFly from AudioQuest).

Any hardware changes are warranty-free and can cause permanent damage. If you are not sure about your skills, you should contact the Xiaomi service center or a proven wizard.

The cost of replacing speakers in the service usually does not exceed 1,500-2,500 rubles (depending on the region), which is cheaper than buying a new phone, and guarantees the preservation of all functions.

FAQ: Frequent Volume Update Questions on Redmi Note 9 Pro