Why Xiaomi headphones have become quietly playing - a full analysis of the causes and solutions

You've turned on your favorite track, but the sound from Xiaomi headphones suddenly became barely audible? The problem is found in owners of all the lines - from the budget Redmi Buds 4 to the flagship Xiaomi Buds 4 Pro. In 80% of cases, the quiet sound is not due to a breakdown, but to software settings or external factors. But how to distinguish a temporary failure from a serious malfunction?

In this article, we’ll look at all the possible causes, from the banal volume limit in smartphone settings to wear and tear of speakers. You’ll learn how to diagnose a problem in 5 minutes, which parameters to check first, and when to carry headphones to the service. And we’ve also collected unique data from models from 2023-2026, where quiet sound is often a factory defect of a particular batch.

Don't rush to buy new headphones - 9 out of 10 times the volume can be restored by yourself.

1. Checking basic settings: what you might have missed

First rule of diagnosis: eliminate the obvious. In 60% of Xiaomi support calls, the problem is solved by adjusting settings that users simply forget.

• 📱 Volume limitation in MIUI: Go to Settings. → Sound and vibration → Media volume. Make sure the slider doesn't move left. Some firmware has a separate item called Safe Volume -- you need to turn it off.
• 🎧 "Silent Sound" mode in headphones: In the Mi Earphones app (for models with the ANC) Check the Sound Effects tab, sometimes Night or Speech mode is activated, which mutes the music.
• 🔊 Sound balance: In the Bluetooth device settings on the phone, the left/right headphone balance can be knocked off. → Connected devices → Headphones → Additionally.
• 🔋 Saving charge: On Xiaomi 13/14 series POCO F5 There is a feature Battery Optimization for Bluetooth, which reduces volume when the battery charge is low phone.

Pay special attention to adaptive volume - a corporate feature MIUI. This feature automatically reduces sound in noisy places (according to the phone's sensors), but sometimes it works wrongly. → Special facilities → Adaptive volume.

⚠️ Note: If you use headphones with two connected devices at the same time (e.g. a phone) + laptop, the volume can automatically go down. This is a feature of the Bluetooth 5.2 protocol.+ Dual Audio, turn off the second device to check.

2. Software failures: when software is to blame

If the basic settings are fine, but the sound is still quiet, the problem is deeper.

• 🤖 Failure of the firmware headphones: Especially relevant for models with ANC (Xiaomi Buds 3 Pro, Redmi Buds 4 Active. After the software update, the calibration of the speakers may be lost.
• 📲 Conflict with MIUI: On phones. Xiaomi/Redmi/POCO firmware MIUI 14 There is a bug that causes Bluetooth devices to work on 70% volume.
• 🔄 Bluetooth module cache: Accumulated connection data can "smother" sound.Cleaned through Settings → Annexes → Show it all. → Bluetooth → Warehouse → Clear the cache.
• 🎛️ Third-party equalizer: Spotify, YouTube Music and even VLC They can mute the sound with their settings. Check the built-in equalizer of these apps.

For models that support Mi Earphones (all Xiaomi Buds and Redmi Buds after 2022), reset:

1. Open the app and go to Headphone Settings → Reset.
2. Confirm the action and wait for the device to restart (the red-blue indicator will light up).
3. Connect the headphones again via Bluetooth.

If the volume didn't recover after the reset, try a forced firmware update via Mi Earphones.

1. Put the headphones on the phone.
2. In the app, go to Settings → Software Update.
3. If the update is not available, click on the gear icon in the upper right corner and select Check Beta Version.

3. Hardware problems: when to carry in the service

If the software methods didn't work, it's the hardware.-5 Hardware causes of quiet sound in headphones Xiaomi:

To diagnose hardware problems, use a 1kHz test audio file (you can download here) if one frequency is much quieter than the others, it's a sign of damage to the speaker.

⚠️ Warning: If you notice that only one earbud is quieter, don't try to disassemble it yourself! Xiaomi Buds 4 Pro and Redmi Buds 5 models use glue UV-curable, and if you open it sloppy, you can damage the microphone or wear sensor.

4.The Impact of Bluetooth: Protocol and Codec Matter

Few people know, but the Bluetooth version and the audio codec used directly affect the volume. 3T Pro when connected via Bluetooth 5.0 sound 15-20% quieter than 5.2 due to differences in sound compression.

Check the current codec like this:

1. On Android: Install the Bluetooth Codec Checker app (free on Google Play).
2. On iPhone: Go to Settings → Bluetooth → i (information) next to the headphones → Codec.

The best codec for Xiaomi:

• 🎵 AAC — Best balance of quality and volume (all models support after 2021).
• 🔊 aptX Adaptive – maximum volume, but only works on phones with Snapdragon 8xx (For example, Xiaomi 12 Pro, POCO F4 GT).
• ⚠️ SBC — The quietest codec used by default on older devices.

To force the codec to change to Android:

1. Activate Developer Mode (7 times click on the MIUI version in your phone settings).
2. Go to Settings. → Additionally. → Developer parameters → Bluetooth codec.
3. Choose. AAC or aptX (if supported).

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If your phone doesn’t support aptX, but the headphones do (like Xiaomi Buds 4), try connecting them to a PC with Bluetooth 5.2. On Windows 11, the codec is automatically selected in the audio settings.

5 External factors: what prevents the sound from "breaking out"

Sometimes the problem isn't with the headphones, it's with how you use them. Here are some non-obvious factors that mute the sound.

• 👂 Ear fit: If the earbrushes don't fit tightly, up to 40% of the bass is lost. ANC (Xiaomi Buds 3 Pro also includes noise reduction mode, which further reduces the volume.
• 🧴 Earwax or cosmetics: Fat deposits on the speaker grid can block up to 30% of sound. Clean your headphones with a cotton swab soaked in alcohol (no more than 70%).
• 🌡️ Ambient temperature: At lower temperatures +5°C lithium-polymer batteries in headphones lose up to 20% of power, which affects the volume.
• 📦 Factory film on speaker: New headphones (especially Redmi Buds 4 Active) sometimes forget to remove the protective membrane.

For models with active noise cancellation (ANC) There's a problem: if the microphones are clogged with dust, the system mistakenly perceives the outside noise as too loud and mutes the sound!).

Run the test:

1. Turn on the music at medium volume.
2. Carefully press your finger on the earpiece from the speaker side.
3. If the sound became louder, the problem is the density of the fit.

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In headphones Xiaomi Buds 3T The Pro and Redmi Buds 5 use a Dual Dynamic Drivers system. If one of the two speakers is jammed, the overall volume drops by 50%, but it's not noticeable on the outside!

Specific problems with models

Some Xiaomi models have unique bugs that the manufacturer does not mention, and we collected data on the most problematic devices:

For Xiaomi Buds 3 Pro and Redmi Buds 4, there is an undocumented Super Volume feature that increases volume by 20%.

1. Put the headphones on the phone.
2. In the Mi Earphones app, click on the firmware version 10 times.
3. In the menu, select Super Volume Mode. → Enable.

⚠️ Warning: Super Volume can distort sound at high frequencies and shorten the life of speakers!

7.When to contact the service: checklist before the visit

If you've tried all the methods, but the sound is still quiet, it's time to contact the service.

At Xiaomi (Mi Service) diagnostics takes 1-2 days. Average repair prices (according to 2026):

• 🔧 Dynamic replacement: 1,200–2,500 ₽ (model-wise).
• 🔋 Battery replacement: 800–1,500 ₽.
• 🛠️ Contact cleansing: 500–900 ₽.
• 🔄 Firming: 300-600 ₽ (sometimes free of charge).

If the headphones are warranty (usually 12 months), repairs will be free when confirming a factory defect. But be prepared that in some cases (Xiaomi Buds 3 Pro with a defective amplifier), the service may offer a replacement with a new model with a surcharge.

Before the visit:

1. Reset the headphones to factory settings.
2. Take a photo of the serial number (located on the case or in the Mi Earphones app).
3. Bring a check or a warranty card (if it is saved).

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In Mi Service services, there is an unspoken rule: if the problem manifested itself in the first 3 months of operation, it is recognized as a warranty even without a check (by serial number).

FAQ: Frequent questions about quiet sound in Xiaomi headphones