Xiaomi smartphone owners often face a situation where the sound in their headphones seems not detailed enough or “flat” even if the headset is expensive. The secret lies not only in the speakers, but also in the way data is transmitted, which is regulated by a Bluetooth codec. It is this algorithm that compresses and transmits the audio stream from your phone to the headphones, determining the final sound quality.
Many users don't know that modern Xiaomi devices support advanced formats like LDAC and aptX HD, but they use basic settings by default. Understanding the difference between codecs will allow you to get the most out of your acoustics. We'll figure out which protocol to choose for listening to music and which one to prefer for games, so that the audio delay is minimal.
In this article, we will take a detailed look at the specifications of each format available in the Xiaomi ecosystem, learn how to force the latent Android capabilities through the developer menu. Proper codec setting is the easiest way to improve the audiophile experience without buying new hardware.
What is a Bluetooth codec and how does it affect sound?
A codec is an encoder program that compresses audio data before sending it over a radio channel. Because Bluetooth bandwidth is limited, the original file (like FLAC or WAV) needs to be reduced in size. The compression algorithm directly affects how many parts are lost in transmission. The higher the bitrate of the codec, the closer the sound is to the original.
Xiaomi smartphones have a lot of standards, but it's often automatic to choose a specific codec, and it tries to compromise between quality and stability. If you don't set priorities manually, the phone can choose the simplest codec to save battery power or provide connectivity in the jammed area.
⚠️ Attention: Automatic codec selection is often focused on call stability rather than Hi-Fi music quality.
Different codecs use different compression techniques: some remove frequencies that the human ear hears less, others simply reduce the depth of the sound color. Understanding these nuances will help you choose the optimal balance between quality and range for your specific earbuds.
Core codecs: from SBC to LDAC
The basic standard for all Bluetooth devices is SBC (Sub-band Coding). It's the common denominator that all headsets can do. It provides acceptable quality for podcasts and calls, but for music, its dynamic range and detail are often insufficient. At Xiaomi, it's used as a fallback mode if other codecs aren't supported.
AAC (Advanced Audio Coding) is a more advanced version, and it's widely used in the Apple ecosystem, but Android, including MIUI and HyperOS, works very well with it. AAC delivers better quality at the same bitrate as SBC, thanks to smarter psychoacoustic compression algorithms.
For Android users, especially with Xiaomi devices, the most interesting formats Qualcomm aptX and Sony LDAC. They are capable of transmitting sound in a resolution close to CD-It is the presence of support for these codecs that makes buying a flagship smartphone justified for music fans.
- 🎧 SBC — basic codec, suitable for speaking and audiobooks.
- 🍏 AAC — standard for iPhone, good quality on Android, provided quality implementation.
- 🎼 aptX / aptX HD — Qualcomm technologies that provide low latency and high resolution.
- 🚀 LDAC — Bitrate leader (up to 990 kbps), developed by Sony, available on many Xiaomi.
Technical comparison: bitrate and sampling frequency
To understand the difference in numbers, you need to look at the characteristics table. Bitrate shows the amount of data transmitted per second. The higher it is, the fewer compression artifacts you hear. However, it is worth remembering that the real bitrate often floats depending on the complexity of the audio signal.
The sample rate (e.g., 44.1 kHz or 48 kHz) defines the upper limit of the frequencies being reproduced. The CD standard is 44.1 kHz, which covers the entire audible range of a person. Formats like aptX HD and LDAC support Hi-Res Audio, operating at frequencies up to 96 kHz and depths of 24 bits.
| Codec | Max. bitrate. | Frequency/Bittle | Delay (MS) |
|---|---|---|---|
| SBC | 328 kbps | 48 kHz/16 bits | ~220 ms |
| AAC | 256 kbps | 48 kHz/16 bits | ~150 ms |
| aptX | 352 kbps | 48 kHz/16 bits | ~40-70 ms |
| aptX HD | 576 kbps | 48kHz/24bit | ~80 ms. |
| LDAC | 990 kbps | 96 kHz/24 bit | ~150 ms |
As you can see from the table, LDAC offers triple bitrate compared to conventional aptX. However, high bandwidth makes the signal more vulnerable to interference. In crowded air (metro, office), the phone can automatically reduce the quality to 330 or 660 kbit / s to maintain the connection.
How to Enable and Select a Codec for Xiaomi
By default, the codec selection menu is hidden from the average user. To access it, you need to activate the developer mode. It's a secure procedure that does not violate the warranty, but requires care when changing settings.
First, open Settings and go to About Phone, find the MIUI Version (or OS Version) and quickly click on it 7-10 times in a row, and then you can go to the settings after you have become a developer.
Go back to the main settings menu, select Additional (or Advanced Settings) → For developers. Scroll down to Network or Bluetooth. There you will find Bluetooth Audio Codec.
☑️ Activation of the codec
⚠️ Note: If only the available codecs are listed SBC, So your current headphones don't support more advanced formats, and changing the setting won't improve sound if the headset can't decode the format you're looking for.
In the Bluetooth Audio Codec menu, select the desired option (for example, LDAC or aptX HD). If the headphones support this standard, the connection will reconnect, and the corresponding icon (for example, LDAC or Hi-Res Audio Wireless) may appear in the status bar.
Use cases: what to choose for games and music
The choice of codec depends on what you do, and the music is critical to detail and wide dynamic range, where the undisputed leader is LDAC (Quality Priority Mode) or aptX HD. They allow you to hear the nuances of the recording that are lost in SBC.
But for mobile games (PUBG, Call of Duty, Brawl Stars), the situation is different: in shooters and competitive projects, minimal latency is important. If the sound of the shot comes later than you see the flash on the screen, this will give an advantage to rivals, in which case you should choose aptX Low Latency (if any) or standard aptX.
Why does LDAC sometimes get interrupted?
For watching videos on YouTube or Netflix, the delay is less critical, since modern Xiaomi smartphones are able to synchronize audio and video stream programmatically. Here you can safely use AAC or aptX HD for better sound without fear of dissynchronizing your lips and voice.
- 🎵 For audiophiles: LDAC (990 kbit/s or aptX HD.
- 🎮 For gamers: aptX LL (Low Latency or regular aptX.
- 📞 For calls: SBC mSBC (special profile for speech).
- 🔋 To save battery life: SBC (consumes less energy in processing).
Compatibility and stability of the connection
Sometimes, after you turn on a high codec, users notice a crack, a stutter or a complete loss of sound. This is due to overloading of the radio channel. Bluetooth operates in the 2.4 GHz band, which is heavily noisy Wi-Fi routers and microwaves.
If you use LDAC If you encounter problems, try finding Bluetooth Audio in the same developer menu. LDAC Codec Priority (Codec Priority) LDAC). Change the value from "Sonic Quality Priority" to "Stable Connection Priority" and this will lower the bitrate, but make listening comfortable.
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If the sound is interrupted only when using the navigator, try turning off the option "Absolute Volume Level" in the Bluetooth settings, which will resolve the volume control conflict between the system and the headphones.
Also, it is worth considering that the antennas in Xiaomi smartphones are arranged differently in different models. In some cases, a tight case or hand position can shield the signal, which is critical for high-speed codecs. AAC Maybe it's the only way out.
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Connection stability is more important than maximum bitrate. If LDAC is running with jerks, it's better to switch to aptX - the difference in quality will be less noticeable than the irritation from constant cliffs.