Why AirPods are quietly playing on Xiaomi smartphones – a full analysis of the causes and solutions

You plugged your AirPods into a Xiaomi smartphone, but the sound was unusually quiet? This problem is familiar to many users, and it's not always related to a headphone malfunction. The fact is that the Apple and Xiaomi ecosystems are initially optimized to different audio standards. In some cases, the volume difference between connecting to an iPhone and Redmi/POCO can be as high as 30-40%.

In this article, we'll not just list the possible causes, but take them from the technical side, from the features of the SBC codec to the limitations of the MIUI firmware. You'll learn how to check if the problem is hardware, what settings should be changed first, and why even a simple reboot sometimes helps. And for owners of older AirPods models (1st or 2nd generation), we have prepared a separate section with the nuances of compatibility.

1. Bluetooth Codecs: Why SBC Limits Volume

The main reason for quiet sound is in audio codecs, which are used to transmit audio over Bluetooth. Xiaomi smartphones by default work with the SBC codec (Subband Codec), the most versatile, but not the most efficient. Unlike the iPhone, where AirPods use proprietary AAC codec with optimized compression, Android (including MIUI) often have to be content with basic settings.

The thing is, SBC has very strict bitrate and dynamic range limits, like:

• 🔊 Maximum bitrate y SBC — 328 kbit/s, whereas AAC can reach 500 kbit/s.
• 📉 Compression in SBC Higher and lower frequencies are more "cut" and are subjectively perceived as quieter sound.
• 🔄 Delays in bitrate switching can lead to temporary volume "failures.

Unfortunately, AirPods don’t support more advanced codecs like aptX or LDAC that could improve things, but even within SBC, you can try to optimize your settings.

MIUI settings: Where to look for volume limits

MIUI firmware is known for its "hidden" restrictions that can affect the volume of Bluetooth devices. Here are the key places to check:

1. Volume Limit for Headphones: Go to Settings → Sound → Headphone Volume and turn off the Safe Level option (if active).
2. Developer Mode: Activate it (7 times click on the MIUI Version in Settings → About Phone), then in Settings → Additional → For developers, find Turn off absolute volume and turn on this option.
3. Equalizer: in Settings → Sound → Equalizer, choose Bass preset or Rock – they often add +2-3 dB to the overall level.

Important: Some Xiaomi models (such as the Redmi Note 10 Pro or POCO F3) have a bug after upgrading to MIUI 14 that resets the volume settings for Bluetooth devices after rebooting, in which case only manual resetting of the audio settings will help.

Turn off "Safe Level" volume |Activate Developer Mode |Enable "Switch off absolute volume" |Check equalizer settings-->

3. Hardware Limitations: Why AirPods 1/2 Generation Play Quiet

If you have a first- or second-generation AirPod, the problem may be the hardware features of these models.

• 🔋 The sound amplifier in the early versions of the AirPods had less power (maximum 100 dB vs. 105 dB in the AirPods Pro).
• 📡 Bluetooth 4.2 antenna (1st generation) is worse at dealing with interference, which can lead to volume drawdowns.
• 🔄 Automatic sound level control in AirPods 2 sometimes conflicts with algorithms MIUI, lowering the volume for safety".

For older models, the good news is that the problem is often solved by upgrading the headphone firmware. Connect AirPods to your iPhone or iPad, update them via Settings → Bluetooth → AirPods → Update your firmware, then plug them back into Xiaomi. In some cases, this gives you a 15-20% volume increase.

4 Conflicts with other connected devices

Few people know, but MIUI has a peculiarity: if several Bluetooth devices are connected to a smartphone at the same time (for example, AirPods + Mi Band fitness bracelet), the system can automatically reduce the priority of the audio stream. This is done to save energy, but leads to volume drawdowns.

How to check:

1. Open Settings → Connections → Bluetooth.
2. Turn off all devices except AirPods.
3. Check the volume – if it has grown, the problem is in the conflict of devices.

Also worth paying attention to background apps that can use a microphone or audio output. For example, Google Assistant or Mi AI sometimes "take" part of the audio channel. To rule out this factor, close all applications through Recent → Close all.

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If you’re using the AirPods Pro with Transparent Mode, try turning it off in your headphone settings (via your iPhone), which Xiaomi may not work properly, lowering the overall volume.

5. Software bugs: When MIUI is to blame

Some versions of MIUI have problems with Bluetooth drivers that directly affect volume.

• 🐛 V MIUI 12.5 was a bug that caused the AirPods to be perceived as "phone headsets" by the system (profile) HFP), Not like a music headphone (A2DP). This automatically lowered the maximum volume.
• 🔄 V MIUI 13 after the update reset Bluetooth Audio settings HAL, which caused the distortion of the sound.
• 📱 Nana POCO X3 Pro and Redmi. K40 There was a problem with the "stick" of the volume regulator at 70%.

Decisions:

1. Update MIUI to the latest stable version (check in Settings → About Phone → System Update).
2. Reset Bluetooth Settings: Settings → Connections → Bluetooth → ⚙️ → Reset the settings.
3. If the problem persists, try to roll back to the previous version of MIUI (the instructions are available on the XDA Developers forum).

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If the AirPods sound is quieter after the MIUI update, reset your Bluetooth settings first, which solves the problem 60% of the time.

Mechanical causes: pollution and wear

Sometimes the problem isn't with the software, it's with the physical condition of the headphones.

• 🧹 Mesh speaker: Even small amounts of earwax or dust can lower volume by a small amount 10-15%. Clean it with a soft toothbrush (without alcohol!).
• 🔋 Battery charge: If AirPods are discharged below 20%, the system automatically lowers the volume to save energy.
• 🔌 Case Contacts: Oxidation or contamination of contacts can lead to unstable nutrition and sound drawdowns.

To check, connect AirPods to another device (like a MacBook or iPad). If the sound is quiet — the problem is in the headphones, if it becomes normal — the fault of the Xiaomi smartphone.

⚠️ Warning: Do not use cotton swabs or alcohol wipes to clean AirPods! Cotton can push dirt deeper into the speaker, and alcohol will damage the protective coating of the mesh. Better use special silicone sticks or compressed air (a canister for cleaning equipment).

7. Alternative solutions: if nothing has worked

If all of the above methods fail, try these non-standard approaches:

The last measure, Xiaomi resetting to factory settings, should only be applied if all other methods are exhausted. Before that, be sure to back up the data through Settings → Additional → Backup.

⚠️ Attention: if after resetting the problem remained, and on other devices AirPods work normally - this may indicate a hardware malfunction of the Bluetooth module in the smartphone.

FAQ: Frequent questions about the quiet sound of AirPods on Xiaomi