How to increase the volume of headphones on Xiaomi Redmi 9T: step-by-step instructions and hidden settings

Xiaomi Redmi 9T owners often face the problem of too quiet sound in headphones — whether it is wired EarPods, wireless TWS or bluetooth headsets. Even at maximum volume, music and video sound muted, and in noisy environments it becomes almost impossible to make out speech in podcasts or calls, the reasons lie in both the limitations of the MIUI firmware and the hardware limits of the Qualcomm Snapdragon 662 chip, which controls the audio tract in this model.

In this article, we’ll look at 7 proven ways to increase the volume of headphones on the Redmi 9T, from the standard Android 10/11 settings to hidden engineering menu options and fine-tuning through ADB. Importantly, some methods require root rights or can cause sound distortion if the safe volume threshold is exceeded. We will specify the risks for each option and give recommendations on how to avoid damaging the speakers.

1. Check basic sound settings in MIUI

Before you resort to radical measures, make sure that the problem is not in the banal settings. On the Xiaomi Redmi 9T there are several “pitfalls” that can artificially turn the volume down:

• 🔊 No Sound Mode: Check if it is activated via the sidebar notifications or volume button.
• 🎧 Individual volume for headphones: in MIUI volume for the speaker and headphones is adjusted separately.
• 🛠️ Adaptive sound: A feature in accessibility settings can automatically lower volume in quiet rooms.
• 🔄 Resetting sound settings: sometimes helps to return factory settings if changes have been made before.

How to check:

1. Connect the headphones to your smartphone.
2. Open any audio app (such as YouTube Music or Spotify) and start playing.
3. Press the physical volume button up - a slider with an icon of headphones should appear on the screen (🎧), not dynamic (🔈).
4. If the icon is a speaker, tap the icon next to the slider to switch to the headphones.

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If the sound automatically decreases after connecting the headphones, turn off the Safe Sound function in Settings → Sound and Vibration → Safe Sound.

Also, look at Settings → Special Options → Audio and disable:

• 🔇 "Monoaudio (can distort stereo sound)
• 🎚️ "Left/right channel balance” (if slider is moved from centre)
• 🔄 "Adaptive sound" (automatically adjusts volume to ambient noise)

2.Use of uniform volume distribution (Dolby Atmos)

Xiaomi Redmi 9T supports Dolby Atmos technology, which not only improves spatial sound, but also allows you to fine-tune the volume for different types of content. However, by default, the profile can be set to "Cinema" or "Voice", which reduces the overall volume.

How to turn on and configure:

1. Go to Settings → Sound and Vibration → Sound Quality and Effects → Dolby Atmos.
2. Activate the switch at the top of the screen.
3. Select the Music or Game profile, which gives you maximum volume.
4. Click on "Settings" (cog in the upper right corner) and turn on:

• 🔊 Volume amplifier (if available)
• 🎛️ Uniform distribution (aligns volume peaks)
• 🔄 Adaptive sound (turn off if it turns down the volume)

After settings are applied, restart audio playback. If Dolby Atmos is not installed by default, it can be downloaded from Google Play (the official Dolby Access app).

3. Engineering menu: hidden volume settings

All Xiaomi smartphones have a hidden engineering menu (Engineer Mode), where you can manually increase the volume limits for headphones. This method does not require root rights, but you need to change the settings carefully - incorrect values can lead to distortion of the sound or even damage to the speakers.

Instructions:

1. Open the Phone app and type in the combination: ##36446337## (or alternative code ##4636##, then select Audio).
2. In the engineering menu, go to the "Hardware Testing" tab → "Audio" → "Headset Mode".
3. Note the settings: Headset Max Vol – maximum volume (usually 140-150 by default) Headset Min Vol – minimum volume Headset Vol Step – volume step

Headset Max Vol

160

Save the settings and restart the phone.

If the engineering menu does not open by code, try an alternative method:

1. Download the MTK Engineering Mode app from Google Play (for MediaTek processors) or Qualcomm EngineerMode app (for Snapdragon).
2. Select Hardware Testing → Audio → Headset.
3. Repeat the steps to change Max Vol.

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The engineering menu is reset after the MIUI update. If the volume drops again after the update, repeat the setting.

4.Configure via ADB (without root)

For power users, there is a way to turn up the volume through Android Debug Bridge (ADB), a tool for debugging Android devices, which does not require root rights, but requires a computer and a developer mode enabled.

Step-by-step:

1. Activate Developer Mode: Go to Settings → About Phone. Press 7 times on "MIUI Version" until the "You're a Developer" notification appears.
2. Turn on USB debugging: Return to Settings → Additional → Developer. Activate the USB debugging switch.

Connect your phone to your PC and execute the commands:

adb shell settings put system volume_music_speaker_scale 15


adb shell settings put system volume_alarm_speaker_scale 15




adb shell settings put system volume_notification_speaker_scale 15




adb shell settings put system volume_system_speaker_scale 15




adb shell settings put system volume_voice_speaker_scale 15




adb shell settings put system volume_ring_speaker_scale 15

These commands scale up the volume for all audio channels, and the first two lines are especially important for headphones (volume_music and volume_alarm). After performing, restart the smartphone.

Install ADB-PC drivers|Enable the developer mode on Redmi 9T|Activate debugging by USB|Connect your phone to the original cable|Check the connection of the adb device team-->

5. Sound amplification applications

If the previous methods didn't work, you can use third-party applications, and they work on two principles:

1. Software amplifier - increases the amplitude of the sound signal (risk of distortion).
2. Equalizer – Optimizes the frequency range for better audibility.

Top.-3 Proven applications for Redmi 9T:

To install ViPER4Android (the most powerful tool) follow the instructions:

1. Download the latest version of APK from ViPER's Audio's official website.
2. Install the application and launch it.
3. At the bottom of the screen, press Driver Status and install the driver.
4. Go to Settings → Equator and select Preset “Extreme Bass + Clarity”.
5. Activate Master Limiter (prevents distortion) and set the value to 95-98%.

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If after installing ViPER4Android sound is gone – restart the phone and check if the driver is activated in the application settings.

6. Hardware causes of low volume

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

• 🔌 3.5mm contaminated connector: dust or contact oxidation reduces signal quality.
• 🔋 Weak battery: at a discharge below 15%, the system automatically reduces the power of the audio amplifier.
• 🎧 Faulty headphones: damaged cable or membrane speaker.
• 🛠️ Damage to the audio chip: after falls or moisture.

How to diagnose:

1. Check the headphones on another device – if the sound is quiet everywhere, the problem is with them.
2. Clean the 3.5mm connector: Use a wooden toothpick (not metal!). Wet the cotton swab in alcohol and gently wipe the contacts. Blow the connector with compressed air (such as a can of keyboard cleaning).
3. Check your energy saving settings: Open Settings → Battery and Performance → Energy Saving Mode. Turn off the "Limit Background Activity" option for audio applications.

If you've had all the manipulations, and you've heard some noises, you can go to the service center, and on the Redmi 9T, the audio chip is soldered into the motherboard, and you need professional equipment to replace it.

7.Alternative solutions: Bluetooth headphones and external amplifiers

If you can’t raise the volume software, consider hardware alternatives:

• 🎧 Bluetooth headphones with support for aptX: the aptX codec provides a higher volume level compared to the SBC or AAC. Sony models will do. WH-1000XM4 or Xiaomi FlipBudds Pro.
• 🔊 Outside DAC/Power: Devices like Fiio BTR3K or iBasso DC05 plug in USB-C and amplify the signal without distortion.
• 🔋 Power Bank with amplifier function: some models (e.g. Baseus PowerLogy) D02) have a built-in audio amplifier.

To connect an external DAC:

1. Buy an amplifier with a USB-C connector (Micro-USB devices will not work for Redmi 9T).
2. Connect. DAC smartphone-wise OTG-adapter.
3. In the sound settings, select "USB-audio" as an output device.
4. Adjust the volume directly on the amplifier.

The advantage of this method is a clean sound without distortion, since the signal is processed by an external device. DAC).

FAQ: Frequent Volume Up questions on Redmi 9T