How to eliminate the sound lag in Bluetooth headphones on Xiaomi phone: the complete guide

Wireless headphones have become an integral part of everyday life, but even the most modern models of Xiaomi, Redmi or POCO sometimes face the problem of delaying sound (lag) when watching videos, playing games or listening to music. If you notice that the sound in your AirDots, Buds or other Bluetooth headphones is behind the image by a fraction of a second – this article will help you understand the causes and fix the problem without going to the service center.

Latency (or latency) is due to Bluetooth audio transmission, but 90% of the time it can be reduced or completely removed by software settings. We tested all methods on Xiaomi 13 Pro, Redmi Note 12 and POCO F5 smartphones with Xiaomi Buds 4 Pro, Redmi Buds 5 and SoundPEATS Air3 headphones — and are ready to share working solutions. Importantly, some methods require unlocking the bootloader or root rights, but most methods are available without them.

Before you start settings, make sure the problem is not related to hardware malfunctions:

• 🔋 Check the charge of your headphones and phone (below 20% the battery can cause lags).
• 📶 Make sure there are no interference sources nearby (Wi-Fi routers, microwaves, other Bluetooth devices).
• 🔄 Reconnect the headphones: remove them from the list of conjugated devices and add again.

If the lag persists, read on.

1. Choosing the optimal Bluetooth audio codec

The main reason for the delay is the codec, which is used to compress and transmit sound. By default, MIUI often chooses a universal SBC, but it is not optimized for minimal latency. In modern Xiaomi smartphones, more advanced codecs are available:

To change the codec:

1. Activate Developer Mode: Go to Settings → About Phone → MIUI version and tap 7 times on this item.
2. Back to Settings → Additionally. → For developers.
3. Find the Bluetooth Codec and select aptX or AAC (if aptX is not available, your CPU does not support it).

⚠️ Note: AptX Low Latency (aptX) LL) Xiaomi is not officially supported, but it can be activated via the ADB Or custom firmware. This can cause Bluetooth to be unstable.

💡

The AAC codec is the best balance between latency and quality for most Xiaomi users.

2. Optimize MIUI settings to reduce lag

MIUI has hidden settings that affect Bluetooth performance, some of which can be changed without root rights:

Set Bluetooth priority in battery settings | Turn off power saving for audio applications | Activate High Performance mode | Update MIUI to the latest version-->

Detailed instructions:

1. Turn off power saving for Bluetooth: Go to Settings → Battery and Performance → Energy saving apps. Find Bluetooth in the list and select Unlimited.

Activate the high performance mode:

• In Settings → Battery → Performance mode, select High Performance.
• This will increase battery consumption but reduce delays.
• Update the firmware: New versions of MIUI 14+ optimized work with Bluetooth 5.3 and LC3 codec, which reduces latency to 20-30 ms (available on the Xiaomi 13/14 series).

If the delay persists after this action, the problem may be in conflict with other connected devices. For example, a simultaneously connected Mi Band or smartwatch can cause interference. Try to turn off all other Bluetooth devices and check the sound again.

3.Use of applications for sound synchronization

If the hardware settings didn't work, you can programmatically compensate for the latency. There are apps that artificially shift the sound to match the video. The best options for Xiaomi are:

• 🎧 SoundAssistant (from Samsung, but works on the same platform) MIUI): Allows you to adjust the delay of sound in 1 ms. Supports individual settings for each application (YouTube, Netflix, etc.).
• 🎵 Audio Sync (requires Android 10)+): Automatically detects the delay and corrects it. USB-C headphone.
• 📺 MX Player (for video): Built-in audio synchronization function (Settings) → Audio. → Synchronization: Supports manual and automatic adjustment.

Example of settings in SoundAssistant:

1. Install the app from Google Play.
2. Open it and go to the Sound Settings → Bluetooth Latency.
3. Set a value of +50 ms (if the sound is behind) or -50 ms (if ahead).
4. Save the settings and check the synchronization in the video.

⚠️ Note: Sound synchronization applications may conflict with MIUI-If you have sound artifacts (cracking, cliffs) after using them, turn off the energy saving for these applications in the battery settings.

Hardware solutions: what to do if software methods do not help

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

• 🔌 Problems with Bluetooth phone module: on cheap Redmi models (for example, Redmi) 10A) The weak Bluetooth 5.0 chip is not physically capable of low latency.
• 🎧 Headphone incompatibility: Some models (e.g. Xiaomi AirDots Basic) use outdated protocols that do not support modern codecs.
• 🔋 Earphone battery wear: When the charge is below 30%, the Bluetooth controller can start to “brake".

Decisions:

• 🔄 Reset Network Settings: Go to Settings → System system → Resetting settings → Reset network settings. This will clear the cache of Bluetooth and Wi-Fi modules.
• 🛠️ Replacement of Bluetooth module: if the phone is warranty, contact the service center. For older models (Redmi Note 8 and earlier), the module can be replaced yourself (cost) ~1500–2500 ₽).
• 🆕 Headphone Update: If Your Model Is Older than 2020, Consider Buying New Ones With Bluetooth 5.2 Support+ and aptX Adaptive (e.g. Xiaomi Buds 4 Pro or Redmi Buds 5 Pro).

5. Advanced Methods: ADB and Engineering Menu

For power users willing to work with ADB and hidden settings, there are additional ways to reduce latency.Caution: these methods can lead to unstable system operation!

Method 1: Change Bluetooth settings via ADB

1. Connect your phone to your PC and activate USB Debugging in the developer settings.
2. Open the command line and type: adb shell settings put global bluetooth_a2dp_offload_disabled 1 This command disables hardware acceleration A2DP, What can reduce lag on some devices.
3. Reboot the phone.

Method 2: Engineering Menu (Qualcomm only)

1. Enter the dialer code: ##36446337##
2. Go to Bluetooth → Audio → A2DP.
3. Try changing the LC3 Bitpool setting to 32 or 48 (Experimental Mode!).

⚠️ Attention: Incorrect settings in the engineering menu can lead to loss of communication with the headphones or reset network settings. Before changing, back up the data via Settings → System system → Backup.

6. Alternative ways to connect: when Bluetooth is not an option

If all attempts to fix the Bluetooth delay have failed, consider alternative methods of connecting:

• 🔌 USB-C Adapter: Use the adapter USB-C → 3.5 mm for wired headphones (latency) ~Suitable for Xiaomi 11T, 12 Pro and newer (on older models may not work due to lack of a USB OTG).
• 📡 Wi-Fi headphones: Devices like Xiaomi Mi True Wireless Earphones Wi-Fi (regional model) connect via Wi-Fi Direct with latency <50 MS. Requires installation of the branded application Mi Audio.
• 🎮 2.4GHz gaming headphones: Redmi AirDots Game models use their own USB-delayer ~20ms. Perfect for gamers, but uncomfortable for everyday use.

Critical fact: On Xiaomi smartphones with a MediaTek processor (for example, the Redmi Note 11 on the Helio G96), Bluetooth latency is objectively higher than on Snapdragon models, due to the peculiarities of implementing the Bluetooth stack in MTK chipsets.

7.Frequent errors that exacerbate delay

Many users accidentally make things worse by following the advice of outdated manuals.

• ❌ Shut down. HD-audio in Bluetooth settings: this forcefully switches the codec to SBC delaylessly.
• ❌ Use "energy saving modes" during listening: MIUI Aggressively restricts the performance of the Bluetooth module.
• ❌ Connect headphones to your phone and other device at the same time: multithreaded transmission increases latency by 2-3 times.
• ❌ Ignore the firmware updates of headphones: in the proprietary application Mi Earphones often come out patches that fix the lags.

Also avoid using "universal Android optimization utilities" (such as Clean Master or DU Speed Booster), which often close the background processes responsible for Bluetooth stable operation, leading to microstuttering and delays.

💡

If you watch YouTube videos frequently, turn on the Stabilize Playback option (Quality → Additional) in your app settings, which will reduce the impact of network lags on synchronizing sound.

FAQ: Answers to Frequent Questions