How to amplify the sound on Xiaomi Redmi Note 9 Pro: from system settings to hidden features

Xiaomi Redmi Note 9 Pro is one of the most popular mid-range smartphones, but many users face the problem of insufficient volume of speakers or headphones. Quiet sound during calls, weak volume of music in noisy rooms or indistinct voice of the interlocutor in instant messengers can seriously spoil the experience of the device. Fortunately, there are several ways to increase the volume without buying external speakers or changing speakers.

In this article, we will discuss all possible methods - from basic settings MIUI Before you go to the engineering menu and third-party apps, it's important to understand that some of the ways you do this require caution: you can get the wrong things to damage your speakers or crash your phone, and we'll explain in detail which methods are safe and where you need to be extremely careful.

If you're ready to improve the sound of your Redmi Note 9 Pro, start with the simplest ways and gradually move on to more complex ones. Remember to check the result after each step - sometimes even small changes have a noticeable effect.

1. Check basic sound settings in MIUI

Before you resort to radical measures, make sure that all system audio settings are set up correctly, often the problem lies in the banal things that users overlook.

Open Settings → Sound and vibration and check the following parameters:

• 🔊 Media volume: Move the slider to maximum, sometimes it gets lost after updating or plugging in the headphones.
• 📞 Call volume: separate regulator for incoming calls.Make sure it's not muted.
• 🎵 equalizer MIUI: Turn it on and select the preset Bass or Rock - this can add volume at low frequencies.
• 🔇 Do Not Disturb: Check if it is activated on a schedule or geolocation.

Pay special attention to the item Additional sound settings (in some versions) MIUI It's hidden behind the "More" button. You can turn it on here:

• 🔄 Adaptive sound – automatic volume adjustment to the surrounding environment.
• 🎧 Improved sound in headphones – Optimization for wired accessories.
• 📱 Mono-sound – combines sound from both speakers into one channel (useful for problems with one of the speakers).

⚠️ Warning: If the sound becomes distorted or wheezing after the setting changes, return all parameters to their original state.

Disable Bluetooth devices|Make sure the headphones aren’t connected|Check the cleanliness of the speakers from dust|Update MIUI last-minute-->

Cleaning of speakers from dust and debris

One of the most common causes of quiet sound is contamination of speakers. - Redmi Note 9 Pro, they're on the bottom of the device, and they're easily clogged with dust, villi from your pocket, or particles from the surface of the table. Even a small layer of dirt can turn the volume down on the table. 30-40%.

For cleaning, you will need:

• 🧹 Soft brush (you can use a clean toothbrush).
• 💨 Compressed air container (optional).
• 🔦 Lighting lamp (to see the pollution).

Step-by-step:

1. Turn off your phone to avoid damage to internal components.
2. Point a flashlight at the speaker, and you'll see a grid with holes, and if they're clogged, you'll notice a buildup of dust.
3. Carefully run the brush along the speaker along the holes, without pressing.
4. If there is a canister with compressed air, short pulses (no more) 1 blot out the speaker from a distance 5-7 centimeter.
5. Check the second speaker (talk, next to the front camera) using the same circuit.

Do not use sharp objects (toothpicks, needles) - they can damage the speaker membrane. Also avoid wet wipes: liquid can leak inside and cause corrosion.

3.Use of engineering menu to increase volume

If the standard settings don't work, you can go to the Engineering Mode. MIUI, where advanced audio options are available, including the ability to increase the maximum volume of speakers and headphones. Please note that incorrect settings in the engineering menu can lead to damage to the speakers or deterioration of sound quality.

How to open the engineering menu:

1. Open the Phone app.
2. Enter the combination: ##36446337## (or #4636## for some versions) MIUI).
3. Select the Hardware Testing option → Audio.

In the Audio section, you are interested in the following parameters:

Do not set the values above the recommended ones, this can overload the speakers and their failure. After changing the settings, press Set and restart the phone.

⚠️ Attention: On some firmware MIUI Changes to the engineering menu are reset after the system update, and there is a risk of activating modes that will affect the microphone or Bluetooth. If there are communication problems after the changes, reset the sound settings in the engineering menu (Restore Default).

4. Apps to amplify sound: top-5 decision-making

If system methods didn't work, you can use third-party applications. They work in different ways: some amplify the sound with an equalizer, others modify the audio stream at the OS level. We selected the 5 most effective and safe utilities for the Xiaomi Redmi Note 9 Pro.

The best applications for amplifying sound:

• 🎛️ Equalizer FX — built-in equalizer with presets for different genres of music. 20-30% frequency-correction.
• 🔊 Volume Booster GOODEV — It's a simple volume booster that can increase the sound to 200 percent of the original level, and it works with speakers, headphones and Bluetooth devices.
• 🎧 Precise Volume – Precise Volume – 1% increments, supports separate profiles for different types of content (music, video, calls).
• 📱 SoundAssistant (from Samsung, but runs on Xiaomi) – advanced sound control with the ability to adjust the balance between speakers.
• 🔇 ViPER4Android FX — Professional audio processor with surround sound and amplifier, requires root rights for full functionality.

Before installing, check the compatibility of the application with your version. MIUI. Some utilities (for example, ViPER4Android) You may be in conflict with system audio drivers, and you may also want to pay attention to permissions if the application requests access to contacts or SMS, That's a reason to be wary.

How to use sound boosters correctly:

1. Install the app from Google Play (avoid third party sites).
2. Run it and follow the setup instructions.
3. Do not increase the volume by more than 50% of the initial level – this is fraught with distortion.
4. Check the sound on different types of content (music, video, calls).
5. If there are wheezing or the phone began to overheat, reduce the level of gain.

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Before installing the sound booster, make a backup of the equalizer settings in MIUI. Some applications reset system presets.

5 Hardware Solutions: When Software Methods Don't Help

If none of the software methods worked, the problem may lie in the hardware of the phone. On the Redmi Note 9 Pro, the following malfunctions are most common:

• 🔈 Damage to the speaker membrane - occurs when listening to music for a long time at maximum volume or after falls.
• 🔌 Contact oxidation – if the phone has been exposed to moisture (even condensate).
• 🔋 Weak audio amplifier - a defect of the motherboard, manifests itself as a quiet sound when connecting headphones.
• 📱 Problems with speaker plume - after disassembling the phone or changing the screen.

How to diagnose a hardware malfunction:

1. Connect high-quality headphones – if the sound in them is loud and clean, the problem is with the phone’s speakers.
2. Check the sound on another device via Bluetooth – if it’s normal, it’s the hardware of the Redmi Note 9 Pro.
3. Record a voice message and listen to it – if your voice sounds quiet or distorted, there may be problems with the microphone or audio track.
4. Try playing the sound through an external Bluetooth speaker – if the volume is normal, the phone’s speakers need repair.

If you suspect a hardware malfunction, you should contact the service center.Self-repair speakers on Xiaomi is difficult because:

• 🔧 Necessities of soldering works (dynamics soldered to the fee).
• 🛠️ Risk of damaging flexible plumes during disassembly.
• 🔍 Difficulties in the selection of original spare parts (there are many fakes on the market).

The cost of replacing the speaker in the service center is usually 1,500-3,000 rubles (depending on the region and the type of speaker - spoken or multimedia).If the phone is warranty, repair can be free, but only if the problem is not caused by mechanical damage.

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Before visiting the service center, back up the data. In some cases, the diagnosis may require resetting the phone to factory settings.

6. Alternative ways to improve sound

If you can't turn up the volume, you can go the other way, which is to optimize your sound perception, and these methods don't increase the physical volume, but they make the sound clearer and more comfortable.

What can be done:

• 🎵 Use external devices: Bluetooth speakers (e.g. Xiaomi Mi Portable Bluetooth Speaker) Wired headphones with amplifier (e.g., Wired headphones with amplifier, 1MORE Triple Driver). FM-Car transmitter (if there is a problem with sound in the car).
• 📱 Set up accessibility: Enable Settings → Special facilities → Amplifiing the sound (if any) Activate the subtitles for the video, which will help in noisy places.
• 🔊 Optimize your content: Download music in format FLAC 320 kbps MP3 — compressed files lose volume. Use volume-normalized players (e.g. Poweramp).

Another effective way is to adjust the environment:

• 🪑 Put the phone on a hard surface (table, stand) – this will increase the resonance of the sound.
• 🔄 Direct the speaker away from you (at an angle of 45).°) — This will reduce the effect of "muffling" the sound with the hand.
• 🚫 Avoid using your phone in the bathroom or shower – humid air makes your sound worse.

If you make frequent calls in noisy places, consider buying a Xiaomi Mi. AI Bluetooth Neckband – These headphones have noise cancellation and a sound amplifier, making conversations clear even on the subway or on the street.

7. Frequent mistakes and how to avoid them

When trying to amplify the sound on the Redmi Note 9 Pro, users often make mistakes that can aggravate the problem or damage the phone.We have compiled the most common ones and explained how to avoid them.

Top.-5 errors in the setting of the sound:

Another common problem is application conflict: some audio amplification tools can block each other or interfere with system services. If the sound is even quieter or lags appear after installing the booster, follow these steps:

1. Close all background applications through Settings → Applications → Launched.
2. Clear the cache of the audio system: Settings → Annexes → Show it all. → Media → Warehouse → Clear the cache.
3. Restart your phone in Safe Mode (click the power button) → "Restart Safe Mode" and check the sound. If it's normal, the problem is in one of the installed applications.
4. Remove the recently installed sound utilities and check the work in turn.

⚠️ Attention: On some firmware MIUI (Especially custom) applications for amplifying sound can cause a constant reboot of the audio system. If after installing the booster, the phone began to "hang" when playing sound, delete the application and reset the audio settings in the engineering menu.

FAQ: Answers to Frequent Questions