How to increase the volume on Xiaomi Redmi 9: from standard settings to hidden functions

Owners Xiaomi Redmi 9 often face the problem of insufficient speaker volume - be it during calls, listening to music or watching videos. The reasons may lie both in software limitations MIUIand in the hardware features of a budget smartphone. In this article we will look at all possible ways to increase the sound: from basic settings to working with engineering menu and installing specialized applications.

It is important to understand that Redmi 9 (models M2003J15SC/M2003J15SS) is equipped with one lower speaker power of ~0.8 W - this is less than that of flagships with stereo systems. However, even in such conditions, you can achieve a noticeable increase in volume without the risk of damaging the device. The main thing is to follow the instructions and not exceed safe gain limits.

If after all the manipulations the sound remains quiet, the problem may be physical damage to the speaker or headphone jack. In this case, diagnostics will be required at a service center. But in 80% of cases it is software methods that help, which we will consider below.

1. Standard volume settings in MIUI

Let's start with the most obvious - checking the basic sound parameters. Many users miss the nuances of the settings MIUI, which can significantly affect the volume.

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

• 🔊 Multimedia volume — adjusts the sound in games, music, videos. Try setting it to maximum, even if the slider is already in the extreme position (sometimes a soft reset is triggered).
• 📞 Call volume —adjustable separately for calls. In Redmi 9 this parameter is often reset after updates.
• 🛎️ Alarm volume — if reminders are working quietly, check this slider.
• 🎵 MIUI Equalizer — in the section Sound quality select a preset Bass or Rock —they automatically raise the overall volume by 10-15%.

Pay special attention to the option Adaptive sound (if it is in your version of MIUI). This feature automatically adjusts the volume depending on the level of external noise, but sometimes does not work correctly. Try disabling it and compare the result.

⚠️ Attention: In some firmware Redmi 9 after updating to MIUI 13/14 the "Sound Quality" section disappears. If it is not there, go to the next method.

2. Disabling volume limits in the developer

Developer mode on Android allows you to bypass some software restrictions, including volume limits. On Redmi 9 this method works stably, but requires care.

First activate developer mode:

1. Go to Settings → About phone.
2. Tap 7 times on the item MIUI version (a notification "You have become a developer" will appear).
3. Return to the main settings menu - a new section will appear there For developers.

Now in the section For developers find:

• 🔇 Disable absolute volume — this parameter is responsible for synchronizing volume levels between multimedia and calls. Disabling it can give +5-10% to the maximum level.
• 🔊 Disable safe volume level — removes EU restrictions on maximum volume (relevant for European firmware Redmi 9).

After applying the changes, restart the phone. The effect will be noticeable immediately when playing music or video. However, remember: prolonged listening at maximum volume can damage the speaker.

3. Engineering menu: hidden sound settings

Engineering menu (Engineer Mode) is a utility tool for testing hardware components. You can manually increase the volume in it. speaker, microphone and headphones. On Redmi 9, access to this menu is opened through a secret code ##36446337## (or ##ENG##).

After entering the code, select:

1. Hardware Testing → Audio
2. In the section Type select Media (for multimedia) or Ring (for calls).
3. In the field Value set the maximum value (usually 160 for Redmi 9).
4. Press Set and reboot your phone.

Warnings:

• ⚠️ Do not set values higher 160 as this may cause sound distortion or damage to the speaker.
• ⚠️ Changes in the engineering menu are reset after resetting the settings or firmware.

Parameter	Recommended value	Effect
Media	150-160	+20-30% volume music/video
Ring	140-150	+15-20% to call volume
Sph (microphone)	130-140	Improves the audibility of your voice to your interlocutor
Sph2 (noise reduction)	0 or 1	Disables/enables noise reduction

⚠️ Attention: The engineering menu interface may differ depending on the firmware version. On some custom builds MIUI the code ##36446337## does not work - in this case, use the application MTK Engineering Mode from Google Play.

4. Applications for sound amplification

If standard methods do not give sufficient results, you can use third-party utilities For Redmi 9 the following applications are suitable (tested for compatibility). s MIUI 12-14):

• 🎛️ Volume Booster GOODEV —increases the volume by 30-40% through a software equalizer. Has presets for Xiaomi.
• 🔊 Equalizer FX —a free equalizer with a function Bass Boostthat indirectly increases the overall volume.
• 🎧 ViPER4Android —professional audio driver with support FX-effects. Requires root access for full functionality.
• 📱 SoundAssistant (from Samsung, but works on Xiaomi) - allows you to fine-tune the volume for each type of content separately.

Installation ViPER4Android on Redmi 9 without root access:

1. Download APK from the official website (version for Android 10/11).
2. Install Magisk Module "ViPER4Android FX" via Magisk Manager (if you have root).
3. In the application settings, select the driver Legacy Mode.
4. Activate Master Limiter and set Gain to +3...+6 dB.

Warning: applications like Volume Booster may cause sound distortion at high frequencies. If wheezing or crackling appears, reduce the level. gain.

5. Checking the physical condition of the speaker

If the software methods do not help, the problem may be in the speaker itself. Redmi 9 the most common hardware faults are:

• 🔍 Clogged grille. speaker - dust and lint accumulate over time, blocking the sound. Clean the hole with a soft brush or compressed air.
• 💧 Moisture ingress —even after drying, oxidized contacts can worsen the sound. In this case, only disassembling and cleaning with alcohol will help.
• 🔌 Poor contact of the cable —if the sound disappears when you press the case, the problem is in the connection of the speaker to the motherboard.
• 🔊 Membrane wear —over time, the speaker loses its elasticity, which leads to muffled sound. Replacement is required.

You can check the speaker using the test:

1. Enter the code in the engineering menu ##0673## or ##0289##.
2. Select Speaker Test.
3. If the sound in the test is quiet or absent, there is a hardware problem.

For a temporary solution (if the speaker is damaged), you can use redirect sound to headphones via a Bluetooth adapter or USB-C adapter. Settings → Accessibility → Sound enable the option Mono audio - this will help you hear better through one earphone.

⚠️ Attention: If you do not have experience disassembling phones, do not try to clean the speaker yourself. Redmi 9 the speaker cable is very fragile and easily breaks if handled carelessly.

6. Alternative ways to enhance sound

If all of the above methods do not work, try these non-standard solutions:

• 🔄 Resetting sound settings - sometimes it helps to reset settings Settings → System → Reset settings → Reset settings sound.
• 📦 Installing custom firmware —for example, Pixel Experience or LineageOS have more flexible sound settings than stock MIUI.
• 🔧 File modification mixer_paths.xml —requires root access. In this file (located in /vendor/etc/) you can manually enter higher volume values.
• 🎵 Using an external amplifier — connect the phone to a portable Bluetooth speaker or USB-C amplifier (for example, FiiO KA3).

For modification mixer_paths.xml (only for experienced users!):

1. Get root access (for example, via Magisk).
2. Using Root Explorer find the file along the path /vendor/etc/mixer_paths.xml.
3. Make a backup copy file!
4. Find lines with parameters RX1 Digital Volume or Speaker Volume and increase the values by 10-20%.
5. Save the file, set permissions 644 and restart the phone.

An example of a change in mixer_paths.xml:

<path name="speaker">
<ctl name="RX1 Digital Volume" value="84" />
<ctl name="Speaker Volume" value="160" />
</path>

⚠️ Attention: Incorrect editing mixer_paths.xml can lead to complete loss of sound. Without a backup, it will be extremely difficult to restore the file.

What to do if the sound disappears after the changes?

If the sound disappears after modifying mixer_paths.xml or working with the engineering menu, return the default settings or restore the backup copy of the file. If this does not help, reset to factory settings (Settings → System → Reset settings).

7. Common errors and how to avoid them

When trying to increase the volume. on Redmi 9 users often make these mistakes:

• 🔊 Setting maximum values in the engineering menu —values above 160 lead to distortion and can burn out the speaker. Optimal range: 140-150.
• 🔄 Ignoring firmware updates —in new ones. versions MIUI often fix bugs with sound. Check the software is up to date in Settings → About phone → System update.
• 🎧 Using non-certified headphones —cheap Bluetooth headphones can artificially limit the volume. Try connecting wired headphones for the test.
• 🔇 Disable all sound effects - some users turn it off MIUI Sound Effects, but this may reduce the volume. Try turning them back on.

Another common problem is automatic volume reduction when connecting headphones. This is due to EU regulations, but is disabled in the developer settings (item Disable EU Volume Limit).

If after all manipulations the sound remains quiet only in a specific application (for example, in YouTube or WhatsApp), clear the cache of this application:

1. Go to Settings → Applications → Manage applications.
2. Select the problematic application.
3. Press Clear cache and Clear data (Attention: this will reset the application settings!).

FAQ: Answers to frequently asked questions

Is it possible to increase the microphone volume on Redmi 9 for better audibility in calls?

Yes, this is done through engineering menu (##36446337## → Hardware Testing → Audio → Type → Mic). Set the value Value in the range of 130-140. Higher values may cause echo or noise.

Why did the sound become quieter after the MIUI update?

In new versions of MIUI (especially 13+), Xiaomi tightens the restrictions on volume due to European regulations. Try:

1. Roll back to the previous firmware version.
2. Install custom recovery (TWRP) and flash the modified MIUI without restrictions.
3. Use Magisk modules like Disable MIUI Battery & Performance Features.

How check if the speaker is damaged?

Possible signs of a malfunction:

• There is sound only at half the maximum volume.
• Wheezing or crackling appears during playback.
• The speaker does not work in test mode (##0673##).
• The sound disappears when you press the housing near the speaker (poor contact).

For an accurate diagnosis, contact a service center. Replacing the speaker with Redmi 9 costs ~800-1200 rubles.

Which headphones are best for Redmi 9, so that there are no problems with sound?

Recommended options:

• 🎧 Wired: Xiaomi Hybrid Pro HD (optimized for MIUI), Sony MDR-EX150AP.
• 🔊 Bluetooth: Redmi AirDots 3, SoundPEATS TrueCaps (good compatibility with MIUI).
• 🎵 USB-C: 1MORE Dual Driver (digital sound without losses).

Avoid cheap no-name headphones - they often have low impedance, which is why MIUI automatically lowers the volume.

Is it possible to increase the alarm volume separately from other sounds?

Yes, in Redmi 9 alarm volume can be configured independently:

1. Open the application Clock.
2. Tap on the alarm clock icon → Settings (gear).
3. Select Alarm volume and set the maximum.
4. Activate the option Gradual increase volumeto wake up smoothly.

If the alarm is still quiet, try installing a third-party application, for example Sleep as Android or Alarmy.