The quality of wireless audio on Xiaomi smartphones often depends not only on the installed drivers, but also on the chosen method of encoding the audio stream. By default, the Android system, including the shell MIUI or HyperOS, automatically selects the most compatible codec, which may not be the best quality. Most often it is a basic SBC, providing only a medium sound, even if your headphones support advanced formats like aptX HD or LDAC.
For audiophiles and owners of high-quality peripherals, standard system choices are not enough. Xiaomi device owners have the unique ability to manually intervene in the data transfer process. Changing the priority of codecs in the hidden developer menu allows you to force activation of high-quality compression algorithms if the hardware part of the smartphone and the connected device support them, which can significantly improve detail and reduce sound latency.
However, before getting to the technical side, it is important to understand that not all Xiaomi models are equipped with the same Bluetooth modules.The flagship lines of Xiaomi Mi and Xiaomi 13/14 Series usually have a full set of codecs, including Sony LDAC and Qualcomm aptX Adaptive. Budget models of the Redmi Note or Poco M series may be limited to the AAC and SBC set due to the features of the installed chipset.
Changing the codec doesn’t require root rights, but it requires careful system settings. Mistudying the headphones can cause the sound to disappear or play back with strong artifacts. So before you start manipulating, make sure your headphones are charged and paired with your smartphone stably.
Types of Bluetooth codecs in the Xiaomi ecosystem
Understanding the differences between compression formats is key to getting the right setup. Xiaomi smartphones, powered by Qualcomm Snapdragon, MediaTek or Google Tensor processors, support different codec sets. SBC (Sub-band Coding) is a mandatory standard that is readable by any Bluetooth device, but it provides the least bitrate and the most compression that cuts high frequencies.
A more advanced standard for users of Apple and many Android devices is AAC (Advanced Audio Coding), which often performs better than SBC on Xiaomi devices, delivering cleaner sound through psychoacoustic modeling, but its effectiveness depends heavily on the implementation in a particular smartphone and the quality of the processor.
For Sony and Hi-Res audio headphone owners, LDAC and aptX codecs are critical. LDAC allows data to be transmitted at bitrates of up to 990 kbit/s, which is three times more than standard Bluetooth. In turn, Qualcomm’s family of codecs, including aptX HD and aptX Adaptive, provides a balance between connection quality and stability, minimizing delays in games.
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Use the Bluetooth Scanner app or similar utilities from Google Play to find out exactly what codecs your particular headphone model supports before changing the settings on your phone.
It’s worth noting that having codec support in the specifications of a Xiaomi smartphone doesn’t guarantee it’s automatically turned on.The system often prioritizes connection stability over quality, choosing a heavier to transmit, but less quality stream if the signal is weak.
Activation of developer mode on MIUI and HyperOS
To access codec management, you need to open a hidden partition of the system. On the MIUI and HyperOS shells, this process is standard, but it has its own nuances depending on the version of Android. First go to the basic settings of the smartphone and find the item About the phone. This is where the information about the system build is hidden.
You'll need to find the MIUI Version or OS Version string. You need to quickly click on it 7-10 times in a row. After a few clicks, a counter will appear, and then a notification that you have become a developer. If you request a lock password, confirm the action.
Once successfully activated, a new Developers Item will appear in the main settings menu, Additional Features (or Advanced Settings), and logging into this section requires password or fingerprint confirmation for security purposes.
☑️ Activation of the developer mode
It is important to understand that the developer mode gives access not only to audio, but also to critical animation parameters, USB debugging and background processes. Do not change the values of parameters that are not sure, as this can lead to unstable interface operation or rapid battery discharge.
⚠️ Attention: Including some experimental features in the developer menu may cause a smartphone reboot or sensor malfunction.Be careful when changing settings not related to Bluetooth.
Setting Codec Priority Through Engineering Menu
Once you enter the developer menu, scroll down to the Network section. We are interested in the Bluetooth LDAC Codec (if available) or Bluetooth Audio Codec. In some versions of MIUI, this item may simply be called Bluetooth Audio Codec.
Click on this. You'll see a list of available codecs supported by your Xiaomi smartphone and your currently connected headphones. If the headphones aren't connected, the list may be empty or only contain SBC. Choose the desired format, such as LDAC or aptX HD.
For the LDAC codec, the system will also offer to select the priority mode: Priority of sound quality, Priority of connection stability or Optimal (adaptive bitrate).
Once you have selected, the settings are applied instantly, but for reliability, it is recommended to reconnect the Bluetooth headset. Go to the Bluetooth settings, click on the gear next to your device and select Forget the device, then pair again.
Using ADB for Advanced Sound Management
In cases where the standard developer menu does not show the desired codecs or the choice is not saved, you can use debugging through the ADB (Android Debug Bridge: This method requires connecting your smartphone to your computer via a computer. USB-cable ADB PC-only.
First, turn on USB Debugging in the same developer menu. Connect your phone to your PC and start the command line. Enter a command to check the connection:
adb devicesOnce confirmed on the smartphone screen, you can enter a command to force the codec to be installed. However, direct replacement of system libraries through ADB without root rights is impossible. ADB is used more for diagnosing or installing third-party modules if the phone is unlocked.
Commands to reset Bluetooth settings via ADB
A safer method through a computer is to use specialized applications installed through ADB, such as Bluetooth Codec Changer (root rights required) or traffic analyzers. For the average user, the method remains most effective through the developer menu described above.
Comparison of characteristics of popular codecs
To make a final decision, it is worth comparing the specifications of the transmission formats, the difference between them is not only in the name, but also in bitrate, sampling frequency and color depth.
| Codec | Max. bitrate. | Frequency of sampling | Depth of color |
|---|---|---|---|
| SBC | 328 kbps | 48 kHz | 16 bits |
| AAC | 256 kbps | 48 kHz | 16 bits |
| aptX HD | 576 kbps | 48 kHz | 24 bits. |
| LDAC | 990 kbps | 96 kHz | 24 bits. |
As you can see from the table, LDAC offers the highest performance, but also consumes more power.The aptX HD codec provides excellent quality with less resource consumption, making it preferred for long listening sessions on Xiaomi.
AAC codec, despite having a smaller bitrate, may sound better than SBC thanks to a more efficient compression algorithm. However, if your Xiaomi smartphone and headphones support aptX, switching to it will give a more noticeable increase in detail in complex musical compositions.
Compatibility and stability of the connection
Forced high-quality codecs can lead to problems: If the Bluetooth signal is weak or there is a lot of interference in the air (for example, on public transport), the sound may be interrupted, in which case the system should automatically lower the quality, but manually banning the SBC can lead to a complete communication breakdown.
A frequent problem on Xiaomi is to desynchronize audio and video in games or YouTube when using high latency codecs, such as LDAC in quality mode. For games, it is better to switch to aptX Low Latency or aptX Adaptive if the hardware allows it.
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If after changing the codec, the sound disappeared or wheezing appeared, immediately return the setting to the value of “Default” or “SBC” in the developer menu.
⚠️ Note: Some third-party memory cleanup applications or "accelerators" may reset Bluetooth codec settings every time you reboot your phone.
Also, when activated by LDAC or aptX HD, headphone battery life can be reduced by 15-20% due to the increased load on the decoding processor inside the headset.
Additional sound settings in MIUI
In addition to codecs, Xiaomi offers its own audio enhancements. In the Sound and Vibration -> Sound Quality and Effects (or Mi Sound), you can activate the graphic equalizer. However, the inclusion of post-processing audio sometimes conflicts with native high-resolution codecs.
It is recommended to experiment: turn on the desired codec, then try to activate or deactivate the Mi Sound Enhancer. In some cases, system improvements "muffle" the benefits of LDAC, making the sound artificial. For clean Hi-Fi listening, it is better to leave only the codec without additional effects.
Don’t forget to update your Bluetooth firmware through MIUI system updates. Xiaomi engineers regularly release patches that improve the stability of communication modules and fix compatibility bugs with popular headphone models.