How to reduce the volume of the speaker in Xiaomi Redmi Note 9 during a conversation: 5 proven ways

The loud speaker in the Xiaomi Redmi Note 9 can be uncomfortable – the interlocutor hears an echo, and you risk deafening from a sharp sound when applying the phone to the ear. The problem is especially relevant for the owners of this smartphone: factory settings often overstate the volume of the microphone and speaker, which leads to distortions of the voice and unpleasant acoustic effects.

In this article, we will look at all the working methods of reducing volume, from standard MIUI settings to hidden parameters of the engineering menu and specialized applications. You will learn how to calibrate sound without loss of communication quality, why the volume control does not always work correctly, and what to do if the problem is caused by a hardware defect.

Why the volume of the speaker is overstated: 3 main reasons

Before you start settings, it is important to understand the root of the problem. In the Redmi Note 9 (models M2003J15SC/M2003J15SS), the over-volume speaker during calls is usually associated with:

• 🔊 Firmware MIUI: Xiaomi artificially increases volume to compensate for weak speakers in budget models. This is a marketing ploy, but it often leads to the opposite effect - distortion of the sound.
• 📱 Hardware constraints: The speaker in the Redmi Note 9 has a fixed volume range, and the software adjustment doesn't always run smoothly. For example, when you go from 50% to 60%, the volume jumps dramatically.
• 🔧 Network settings: In VoLTE or VoWiFi modes, the sound can be automatically amplified for better audibility, but this is not always appropriate.

Interestingly, the problem is more common on MIUI 12.5 firmware and later, where Xiaomi has implemented a smart volume algorithm that adapts sound to indoor noise levels, but this algorithm often works incorrectly, especially in quiet rooms. If you notice that the volume spontaneously changes during a conversation, this is the fault of this feature.

Method 1: Standard volume control through buttons

The most obvious method is to use physical Volume Up/Down volume buttons when making a call.

1. During an active call, press the Volume Down button on the left side of the smartphone.
2. The volume slider will appear on the screen, move it to the left to a comfortable level. Note that in MIUI, the speaker controller is separated from the media sound.
3. If the slider does not respond or resets after the call is completed, then the Adaptive Volume mode is activated in the system (we will discuss it below).

Important: In the Redmi Note 9, the default volume buttons regulate media sound (music, video) rather than a conversational speaker.

⚠️ Warning: If the speaker complains that he can't hear you well after the volume drops, the problem may be in the microphone, not the speaker, in which case check the cleanness of the microphone hole (it is located in the bottom of the case next to the connector). USB-C).

Method 2: Disabling Adaptive Volume and other Automatic Adjustments

MIUI has hidden features that automatically adjust volume to the ambient noise, to turn them off:

1. Go to Settings → Special Options → Adaptive Volume.
2. Turn off the slider at the top of the screen.
3. Return to the main settings and select Sound → Additional settings.
4. Turn off the options: 🔇 Increased volume in headphones (affects the speaker) 🔊 Automatic volume control

After this, the volume stops jumping during a conversation, and if the Adaptive Volume option is not in your firmware, it is integrated into the core of the system, in which case only the engineering menu (mode 4) will help.

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If the adaptive volume is too quiet after the switch is turned off, try to increase it through Settings → Sound → Call Volume. In some versions of MIUI, this controller duplicates physical buttons, but works more stable.

Method 3: Using third-party applications to fine-tune

If standard methods don’t work, Google Play apps will come to the rescue, allowing you to adjust the volume to an accuracy of 1%, as well as adjust the left and right channels separately (relevant if the speaker is not working evenly).

The best apps for Redmi Note 9:

• 📱 Volume Booster (by Good Mood Apps) – allows you to increase or decrease the volume above the system limits. Supports a separate setting for the conversational speaker.
• 🔊 Precise Volume - gives access to hidden levels of Android volume. ADB fully functional.
• 🎛️ SoundAssistant (by Samsung, but powered by Xiaomi) – adds separate sliders for each type of sound, including a call.

Instructions for setting up Precise Volume:

1. Install the app from Google Play.
2. Open it and give access to the sound settings.
3. Select the Call Volume tab.
4. Move the slider to the left to reduce the volume. The app will show the current value in decibels (dB).
5. Press Apply and make a test call.

⚠️ Attention: Apps like Volume Booster can increase the load on the speaker, causing premature wear and tear, and do not set the volume above 85% of the maximum, even if the program allows it.

Install the app from the official store |Provide all requested permissions |Check current volume in the MIUI |Save backup of the audio settings |Test changes on a short call-->

Method 4: Engineering menus – hidden audio settings

For power users, the most effective method is the Engineering Mode, which allows you to manually configure the speaker, microphone and network settings. Attention: incorrect changes to the engineering menu can lead to communication failures or complete loss of sound.

How to open the engineering menu on Redmi Note 9:

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. In the menu that appears, select Phone Information (or Phone Information in English firmware).
4. Scroll down to the Set audio mode or Sound block.

Then proceed according to the version of the firmware:

• 🔧 V MIUI 12.5+: Choose Audio. → Volume. Find Sph, which is the volume of the speaker. Decrease the volume of the speaker. 150 before 100-120 (optimally for most users).
• 📶 V MIUI 11-12: Go to Hardware Testing → Audio → Normal Mode. Select Receiver. In the Value field, type 80 (minimum safety value).

After the changes, restart your phone. If the sound is gone, go back to the engineering menu and reset the settings to the factory (Restore Default).

Method 5: Hardware Solutions – When Software Methods Don’t Help

If none of the above methods worked, the problem may lie in the hardware:

• 🔈 Contamination speaker: Dust and pile block the sound holes, causing the sound to become louder but less clear.
• 🔌 Trail damage: After falling or disassembling the phone, the speaker's contacts may oxidize.
• 🔋 Wear of the speaker: Over time, the membrane dynamics deform, which leads to distortions at high volume.

What you can do on your own:

1. Clean speaker: Use a soft brush or compressed air (a canister for cleaning equipment). Do not use alcohol or liquids - they can damage the membrane.
2. Trail check: If the phone is falling, inspect the speaker connector (requires disassembly). When oxidizing the contacts, clean them carefully with a blower.
3. Replacement speaker: Original speaker for Redmi Note 9 has articular XM-12345-DYN (Check with the seller. The cost of replacement at the service center: 800-1500 ₽ (spare-less).

⚠️ Warning: If the speaker is quieter after cleaning, but wheezing appears, this is a sign of damage to the membrane. In this case, the speaker must be replaced - further operation may lead to its complete failure.

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Before disassembling the phone, be sure to turn off the battery for 10-15 minutes. In the Redmi Note 9, the speakers contacts are located close to the antenna tracks - careless movement can damage the communication module.

More tips: How to avoid loudness problems in the future

To avoid over-volume after resetting settings or updating your firmware, follow these recommendations:

• 📲 Update regularly MIUI, But don’t install beta versions – they often contain sound bugs.
• 🔄 Reset your audio settings after major updates: Settings → Annexes → Application management → Phone. → Warehouse → Clear the data.
• 🛠️ Use cases without overlapping the speaker. In the Redmi Note 9, the speaker is located at the top of the screen - many cases block it, making the sound louder but less legible.
• 🎧 Try the headset: if the problem is only with the speaker, Bluetooth headphones or a wired headset will solve it without settings.

If you make frequent calls in noisy places, consider buying an external noise-cancelling microphone (like the Xiaomi Bluetooth Neckband).It connects over Bluetooth and completely replaces the phone's built-in microphone, eliminating loudspeaker issues.

FAQ: Frequent questions about the loudspeaker volume in the Redmi Note 9