How to increase the volume in headphones on Xiaomi Redmi Note 9 Pro: all working methods

Xiaomi Redmi Note 9 Pro is a popular smartphone with excellent value for money, but many users face the problem of not loud enough in headphones. Even at maximum volume, music or video can sound quiet, especially when using budget models of headphones. The reasons for this are as much as software constraints. MIUI, and in the hardware features of the audio track.

In this article, we’ll look at all the possible ways to increase headphone volume, from standard settings to hidden engineering menu features and third-party apps. It’s important to understand that some methods can affect sound quality or even device safety, so we’ll explain the risks in detail and give recommendations for minimizing them.

Why the sound in the headphones on the Redmi Note 9 Pro can be quiet

Before you start setting up, you should understand the causes of low volume, and here are the main factors that can affect the sound level:

• 🔊 Limitations MIUI: Xiaomi firmware artificially lowers the maximum volume to protect users’ hearing and headphone dynamics from damage.
• 🎧 Headphone resistance: High impedance (resistance) models require more power to achieve the same volume as low impedance headphones.
• 🔌 3.5mm connector quality: The Redmi Note 9 Pro uses a standard audio jack, but its contacts may become oxidized or contaminated, resulting in signal loss.
• 📱 Hardware Amplifier Limitations: The smartphone's built-in audio amplifier may not provide enough power for some headphone models.
• 🔋 Battery Savings: In power saving modes, the system automatically lowers volume to reduce processor load.

If the problem comes suddenly, you should first check the headphones on another device, and it may not be the smartphone, but the headphones or the cable themselves, and also make sure that the connector is free of dust or debris, which is a common cause of poor contact.

Method 1: Volume settings using standard MIUI parameters

Let's start with the simplest and most secure methods that do not require the installation of additional applications or interference with system files. MIUI There are a few hidden options that can help increase volume.

The first thing you need to do is check the balance of sound between the left and right earphones, and sometimes the uneven distribution of volume makes it seem that the sound is too quiet.

1. Connect the headphones to your smartphone.
2. Open the Settings. → Sound and vibration → Headphone balance.
3. Move the slider in the middle if it is shifted to one side.

If the balance is fine, try enabling Adaptive Sound, which automatically adjusts the volume to the surrounding noises:

• 🔈 Go to Settings. → Special facilities → Adaptive sound.
• 🔊 Turn on the switch and select the Music or Multimedia profile.
• 🎵 Adjust the sensitivity of the microphone if the function is unstable.

Another useful parameter is Low-frequency amplification, which doesn't increase the overall volume, but it makes the sound more saturated, which subjectively improves perception.

• 🎛️ Open the Settings. → Sound and vibration → Sound quality.
• 🔊 Activate Low Frequency Amplification or Equalizer.
• 🎧 Select the Bass Preset or manually lift the sliders at 60-250 Hz frequencies.

Method 2: Use of the MTK Engineer Mode

If the standard settings didn't work, you can try to turn up the volume through the engineering menu. This method requires caution, since improper changes can lead to malfunctions in the audio system. The Redmi Note 9 Pro uses a Qualcomm Snapdragon processor. 720G, This will be different from the devices on MediaTek.

To open the engineering menu:

1. Open the Phone app.
2. Enter the combination: ##36446337## (code for Qualcomm).
3. Select the Hardware Testing option → Audio.

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

• 🔊 Headset Mode - mode of work with headphones.
• 📊 Max Vol - Maximum volume level (default value is usually 150-160).
• 🔧 Type – Type of connected headphones (check that Headset is selected, not Speaker).

To increase the volume:

1. Select Headset Mode.
2. In the Max Vol field, increase the value by 10-20 units (for example, from 150 to 170).
3. Press Set to save.
4. Reboot your smartphone.

⚠️ Warning: Increasing the Max Vol above 180-200 can cause sound distortion or damage to the earphone speakers.

Method 3: Applications for sound amplification

If you don't want to interfere with system settings, you can use third-party apps that work as an additional audio amplifier, processing the audio stream before you output to your headphones.

For installation ViPER4Android (The most powerful but difficult option, follow the instructions:

1. Download the archive with XDA Developers (version for Qualcomm).
2. Install. APK-file-driver ViPER4Android FX.
3. In the application settings, activate Master Power and enable ViPER Driver.
4. In the Effect section → Volume to increase Playback Gain Control to +3–+6 dB.

⚠️ Attention: When in use ViPER4Android without root rights, the sound may periodically break. Stable operation requires installation via Magisk or modified recovery.

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Before installing any sound amplifier, check its compatibility with your version. MIUI. Some applications may conflict with system services, causing freezes.

Method 4: Set up the equalizer in the player

Many users overlook that built-in or third-party players have their own audio settings that can significantly improve volume.For example, the standard Music app from Xiaomi has a hidden equalizer.

To activate it:

1. Open the Music app.
2. Play any track you want.
3. Touch the badge. ⚙️ Settings in upper right corner.
4. Select the Equalizer and activate it.
5. Choose preset Rock or Pop – these usually have elevated medium and high frequencies, making the sound subjectively louder.

For more flexible settings, we recommend using players with advanced audio settings:

• 🎵 Poweramp: Supports 10-band equalizer, pre-settings and bass enhancement.
• 🔊 Neutron Music Player: 32-bit audio processing, parametric equalizer and Preamp feature for increasing volume.
• 🎧 JetAudio: Built-in sound amplifier (up to) +20 dB) and environmental effects.

In Poweramp, for example, you can turn up the volume as follows:

1. Open the settings → Audio → Equalizer.
2. Activate the equalizer and select Preset Loudnes.
3. In the Toncompensation section, increase the value of Pre-Amp to +3–+5 dB.
4. Save the settings as a user profile.

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Using an equalizer player is the safest way to increase the volume, as it does not affect the system settings and does not risk damaging the speakers.

Method 5: Cleaning the 3.5mm connector and checking the cable

If all the software methods didn't work, the problem could be a physical connection, and the 3.5mm connector on the Redmi Note 9 Pro gets dusted, oxidized, or damaged over time, causing contact loss and, as a result, lower volume.

To clean the connector:

1. Turn off your smartphone.
2. Take a wooden toothpick and carefully remove visible dust from the connector.
3. Wet the cotton swab in alcohol (at least 70%) and wipe the contacts inside the connector.
4. Allow the alcohol to completely evaporate (5-10 minutes) before connecting the headphones.

Also check the headphone cable for damage:

• 🔍 Inspect the 3.5mm plug for bent contacts or corrosion.
• 🎧 Check the cable over the entire length – often rubbing occurs at the base of the plug or near the speakers.
• 🔌 Connect your headphones to another device to make sure they aren’t the problem.

If the connector is damaged (for example, staggers or does not fix the plug), you can try to press it yourself:

1. Carefully tuck the metal shell of the connector with a thin screwdriver.
2. With a light press, return the contacts to the original position (do not overdo it!).
3. Check to see if the sound is better.

⚠️ Warning: If the connector is still unstable after cleaning, do not try to disassemble the smartphone yourself - this may lead to loss of warranty.

Method 6: Update firmware and reset settings

Sometimes the low volume is caused by software errors in the firmware. Xiaomi regularly releases updates for the Redmi Note 9 Pro, which fix bugs in audio drivers.

1. Go to Settings → About the phone → System update.
2. Click Check for updates.
3. If a new version of MIUI is available, download and install it.

If the update didn’t help, try resetting the sound settings to factory:

1. Open Settings → System → Additional → Resetting settings.
2. Select Resetting Sound Settings (not to be confused with a full reset!).
3. Confirm the action and restart the smartphone.

In extreme cases, you can perform a full reset, but this will delete all data from the device.

• 📱 Go to Settings. → The phone. → Backup.
• 🔄 Select Backup in Mi Cloud or save data to your computer.
• ⚙️ After resetting, restore the settings from the backup.

After resetting to factory settings, the volume in the headphones can increase, as all user equalizer profiles and restrictions set by third-party applications will be removed.

Method 7: Alternative methods (for advanced users)

If none of these methods worked, you can try more radical methods, which require technical skills and can pose risks to the device.

1. Modification of the file mixer_paths.xml

This file contains audio routing settings and volume limits to change it:

1. Get root rights (for example, through Magisk).
2. Using a file manager (such as Root Explorer) go to /system/vendor/etc/.
3. Find the file. mixer_paths.xml And back it up.
4. Open the file in the text editor and find rows with RX1 Digital Volume or Headphone Volume options.
5. Increase your max by 10-20% (e.g., from 80 to 96).
6. Save the file, set resolutions 644 and restart the smartphone.

Installation of the custom core

Some custom cores (e.g., FrancoKernel or ElementalX) have improved audio drivers with higher volume support.

1. Unlock the bootloader through the Mi Unlock Tool.
2. Install custom recovery (TWRP).
3. Download the compatible kernel for the Redmi Note 9 Pro (model joyeuse).
4. Sweat the core through recovery and clear the cache.

⚠️ Warning: Modifying system files or installing custom software will void the warranty and may result in a device "brick."Be sure to have a backup before any changes. EFS and NVRAM.

FAQ: Frequent questions about increasing the volume in headphones