How to increase the volume of the speaker on Xiaomi Mi 9T Pro: proven methods

The speaker on the Xiaomi Mi 9T Pro (aka Redmi K20 Pro) is often criticized for the quiet sound during calls.The problem is especially noticeable in noisy rooms or when using hands-free. The manufacturer limits maximum volume due to European security standards, but these restrictions can be circumvented - both software and hardware.

In this article, we will look at 7 proven ways to increase the volume of a speaker, from simple settings to modifying system files. Importantly, some methods require unlocking the bootloader or root rights, which may be insecure, we will specify the risks for each option and give recommendations for security.

If you are not ready for radical change, start with safe ways. 1–3). For experienced users, methods with an engineering menu or editing will be suitable mixer_paths.xml. At the end of the article — FAQ answering frequent questions and comparing methods on effectiveness.

⚠️ Warning: Increasing the volume above factory values can cause sound distortion or damage to the speaker. Xiaomi is not responsible for hardware breakdowns after modifications.

1. Checking basic sound settings

Before you start complex manipulations, make sure that the problem is not the software settings. There are hidden parameters on the Mi 9T Pro that can affect the volume of the speaker.

Open the phone app and check when calling:

• 🔊 Volume slider - sometimes it resets after updates MIUI.
• 📞 Hands-free mode – turn it on and compare volume.
• 🎧 Connected headphones – if the 3.5mm connector is contaminated, the smartphone can “think” that an external device is connected, and turn down the loudspeaker.

Also go to Settings → Sound and Vibration → Volume and check:

• 🔇 Separate regulators for multimedia, calls and alarm clocks.
• 🔄 Adaptive Sound – it automatically adjusts volume depending on ambient noise (may work incorrectly).

If the volume has not changed after these manipulations, proceed to the next section.

2. Cleaning of the speaker and connectors from dust

A common cause of silent sound is contamination of the speaker or 3.5 mm connector. On the Mi 9T Pro, the speaker is located at the top of the screen (near the front camera). Dust and pile can block sound waves, reducing the volume by 30-50%.

How to clean the speaker:

• 🧹 With a soft brush (for example, for makeup), gently walk along the speaker grille.
• 💨 Compressed air canister - direct the jet at an angle of 45° 5-7 cm apart.
• 📱 Scotch or sticky tape - glue a piece to the grille and rip off (remove fine dust).

To clean the 3.5mm connector, use a toothpick with cotton wool soaked in alcohol. Do not use metal objects - they can damage the contacts!

⚠️ Warning: Don't blow into the speaker with your mouth - moisture from the breath can oxidize the contacts. If the sound doesn't improve after cleaning, the problem lies in the software part.

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Before cleaning, turn off the smartphone and remove SIM-map to avoid closing contacts.

3.Use of the engineering menu (without root)

The Engineering Mode allows you to fine-tune the sound parameters, including the volume of the speaker, which does not require root rights, but changing some parameters can cause malfunctions.

How to open the engineering menu:

1. Open the phone app.
2. Enter the code: ##4636###.
3. Select “Phone Information” (or “Hardware Testing” → “Audio”).

In the Audio section, find the parameters:

• 🔊 Sph Mode – set the value of “Normal” (if you have Headset or LoudSpeaker»).
• 📞 Volume – try to increase the values for “Voice Call” (talk speaker).
• 🔧 Type – Select Media or Ring, then return to Voice Call and adjust volume again.

⚠️ Note: Not all versions MIUI They support volume change through the engineering menu. If the parameters are locked, move to the next method.

4.Apps for amplification of sound (without root)

If system settings don't work, you can use third-party utilities, they work as an intermediary between the OS and the speaker, amplify the signal at the software level.

Top.-3 supplant 9T Pro:

How to configure Equalizer FX for maximum effect:

1. Install the app and give access to the microphone and sound settings.
2. Select the preset "Bass Boost" or "Loudness".
3. Manually lift the sliders 100-150 Hz (for bass) and 3-5 kHz (for voice).
4. Activate the option “Low Frequency Vibration” (if you need tactile recoil).

⚠️ Warning: When using sound boosters, battery discharge increases by 10 to 15 percent. Turn off amplifiers when they are not needed.

Make sure the volume in the settings is at maximum

Close background applications (especially messengers with voice messages)

Check the battery power (minimum 30%)

Back up your audio settings (Equalizer FX has an export option)

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5. Editing mixer_paths.xml (root)

The most effective way is to manually edit the system file. mixer_paths.xml, It requires an unlocked bootloader and root rights, but it gives maximum amplification without loss of quality.

Step-by-step:

1. Install Root Explorer or Solid Explorer with root support.
2. Cross the path: /vendor/etc/mixer_paths.xml or (for some firmware): /system/vendor/etc/mixer_paths.xml
3. Make a backup file (copy it to the file) SD-map).
4. Open the file in a text editor (e.g. QuickEdit).
5. Find the following lines: <path name="handset-mic"> <ctl name="RX1 Digital Volume" value="84" /> and <path name="speaker"> <ctl name="RX3 Digital Volume" value="84" />
6. Increase the value from 84 to 90-95 (maximum 100, but it’s risky!).
7. Save the file and restart the smartphone.

Critical information: On some firmware MIUI The path to the file may be different. If the sound is gone after the changes, restore the original file. mixer_paths.xml from the backup and check the way again.

⚠️ Attention: Incorrect editing mixer_paths.xml It can cause you to lose sound completely or loop the download. If you're not sure about yourself, use methods without rooting.

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Editing mixer_paths.xml increases the volume of 30–50%, But it requires a precise follow-up of the instructions, and a single character error can make the speaker fail.

6. Modification via Magisk (for power users)

If you already have Magisk installed, you can use special modules to amplify sound, which is less risky than manual file editing, since the modules are tested by the community.

The best Magisk modules for the Mi 9T Pro:

How to install ViPER4Android FX:

1. Download the module from the Magisk: XDA Developers repository.
2. Install it through Magisk Manager (Modules section).
3. Reboot your smartphone.
4. Open the ViPER4Android app and activate the driver.
5. In the Master Limiter section, raise the value to 5-7 dB (no higher, otherwise there will be distortions!).

⚠️ Warning: After installing the modules, check the microphone – some modifications may reduce sensitivity when recording voice.

7 Hardware methods (replacement of speaker or amplifier)

If the software methods did not help, the problem may be in the hardware:

• 🔧 Wear speaker - over time, the membrane loses elasticity, and the volume drops.
• 🔌 Poor plume contact – oxidation or breakage of wires between the motherboard and speaker.
• 🔊 Failure of the sound chip (less often) – requires soldering or replacement of the chip.

How to diagnose a hardware problem:

1. Connect headphones – if the sound in them is loud, and in the dynamics is quiet, the problem is in the dynamics or plume.
2. Call your smartphone from another phone and turn on speakerphone – if the sound is distorted or intermittent, the amplifier may malfunction.
3. Check the speaker for vibration – if at maximum volume the body does not vibrate, most likely the membrane is damaged.

Cost of repair (approximately):

⚠️ Note: When replacing the speaker with Mi 9T Use original parts (articles: MDY-006). Chinese analogues often have the worst sound quality.

FAQ: Frequent Volume Update Questions on Mi 9T Pro