How to increase the volume of headphones on Xiaomi Redmi Note 9 Pro: safe and effective methods

Xiaomi Redmi Note 9 Pro is a popular smartphone with powerful hardware, but many users are faced with the problem of insufficient volume in the headphones. Even at maximum settings, music or video can sound too quiet, especially in noisy environments, the reasons for this lie in the limitations of the manufacturer, protection from damage to the speakers and the features of the MIUI firmware.

In this article, we’ll look at all the proven ways to increase the volume of the Redmi Note 9 Pro headphones, from standard settings to hidden engineering menu features. It’s important to understand that over-amplifying the sound can cause distortion or even damage to the headphones. So we’re focusing on safe methods that don’t break the warranty or damage the hardware.

If you use wired or wireless headphones, but the sound still leaves much to be desired, read on. We tested each method on the Redmi Note 9 Pro with the current versions of MIUI 12/13/14 and are ready to share the results.

1. Check basic sound settings in MIUI

Before you resort to radical methods, make sure that all standard settings are set up correctly, often the problem lies in the wrong sound profile or the amplifiers that are disabled.

Open Settings → Sound and vibration. Here, pay attention to:

• 🔊 Sound Mode: Select Music or Movie for maximum volume.
• 🎧 Headphones Enhance: Turn on the Option MI Sound Enhancer (if available in your firmware).
• 🔄 Equator: Activate Basa or Rock preset – they automatically raise the general volume.
• 🚫 Volume Limit: Turn off Safe Sound Level in the Additional section.

If the sound remains quiet after this manipulation, move on to the next step. On some versions of MIUI, the MI Sound Enhancer option is hidden - it can be activated through the engineering menu (more on this below).

2.Use of the engineering menu to unlock volume

Engineering Mode is a hidden MIUI section where you can manually adjust audio settings, including volume limits, which requires caution because incorrect settings can cause distortion or damage to the headphones.

To open the engineering menu:

1. Open the Phone app.
2. Enter the code ##36446337##
3. Select Hardware Testing → Audio → Headset Mode.

In this section you will see the parameters:

• 🔢 Max Vol: Current maximum volume (usually 150 or 160).
• 🔧 Type: Choose Media for Multimedia or Voice Call for Calls.
• 📊 Value: Increase the value of 10-20 units (e.g. with 150 before 170).

Turn up the volume by no more than 20% of the standard value | Check the sound after each change | Do not exceed 180 for Media|Reset the settings if there are distortions-->

Warning: If the sound is hoarse or intermittent after the changes, return the standard values. On the Redmi Note 9 Pro, the maximum safe value for Media is 175, for Voice Call is 160.

⚠️ Warning: Changes to the engineering menu are not saved after resetting. If you update the firmware, the settings may return to standard.

3. Apps to amplify sound: top-3 tested

If the standard settings and the engineering menu didn't work, you can use third-party apps, and we tested dozens of utilities and selected those that actually work on the Redmi Note 9 Pro without lags or advertising.

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

1. Download APK with XDA Developers.
2. Install the ViPER4Android FX app and driver.
3. In the settings, select Audio Compatibility Patch and restart your phone.

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Before installing third-party equalizers, turn off the standard MIUI equalizer in Settings → Sound → Equalizer to avoid conflicts.

Important: Apps like Volume Booster can turn up the volume by distorting the sound, and if you hear wheezing, reduce the amplification.

4. Update firmware and reset sound settings

Sometimes the problem with quiet sound in headphones is due to software bugs. Xiaomi regularly releases updates for the Redmi Note 9 Pro, where the sound stack errors are fixed.

1. Go to Settings → About the phone → System update.
2. If an update is available, install it and restart the device.
3. After the update, reset the sound settings: Settings → Applications → App management → Sound → Storage → Clear the data.

If there are no updates but the problem persists, try resetting the sound settings via Safe Mode:

• 🔄 Press the power button and select Reboot in Safe Mode.
• 🎵 Check the volume of the headphones in safe mode (all third-party applications are disabled here).
• 🔙 If the sound is normal, remove the newly installed programs.

⚠️ Warning: Resetting audio settings via Clear Data will return all settings to factory settings, including custom equalizer profiles.

5. Hardware causes of silent sound and their elimination

If the software methods didn't work, the problem could be the hardware, and here are the most common reasons and ways to diagnose them:

• 🔌 3.5mm contaminated connector: try brushing it with a wooden toothpick (carefully!) or compressed air. Dust and contact oxidation can reduce volume.
• 🔋 Weak battery: with low charge (less than 15%) MIUI It automatically reduces the power of the sound.
• 🎧 Faulty headphones: test them on another device. If the sound is quiet everywhere, the problem is with the headphones, not the phone.
• 🔊 A damaged sound chip: If the sound is quiet in the speaker and headphones, it could be a hardware malfunction.

For the diagnosis of a 3.5 mm connector:

1. Connect the headphones and slightly move the plug in the connector.
2. If the sound appears, it disappears – the contacts are oxidized or bent.
3. Try using a Type-C → 3.5mm adapter (if your model supports digital audio).

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If the quiet sound is only seen in one headphone, the problem is precisely in the cable or headphone dynamics, not the phone.

The Redmi Note 9 Pro can also trigger overheating protection. If the processor heats up (e.g. during games), MIUI automatically lowers the volume to reduce the load. Check the temperature in Settings → About Phone → Condition.

6.Alternative solutions: Bluetooth headphones and external amplifiers

If all methods have been tried, but the sound in the wired headphones is still quiet, consider alternative options:

• 🎧 Bluetooth headphones with AAC/aptX: Redmi Note 9 Pro supports high-quality codecs that can sound louder than wired headphones.
• 🔊 External amplifier (DAC): devices like Xiaomi USB-C DAC fiio BTR3 Bypass the built-in limitations of the phone.
• 🔌 Type-C headphones with active amplification: models with their own amplifier (for example, 1More Dual Driver is not dependent on the power of the phone.

To connect an external DAC:

1. Buy a USB-C → 3.5mm adapter with built-in amplifier (e.g. Xiaomi Hi-Res DAC).
2. Connect it to your phone and select the external audio device in the sound settings.
3. Adjust the volume directly to the DAC (many models have their own regulators).

The advantage of external DAC is that it not only amplifies the sound, but also improves the sound quality with a high-quality digital-to-analog converter, which is especially noticeable when listening to music in FLAC or WAV format.

FAQ: Frequent questions about headphone volume on the Redmi Note 9 Pro