How to increase the sound on bluetuz headphones Xiaomi smartphones

Owners of Xiaomi, Redmi and POCO smartphones often face situations where the volume of the wireless headset seems insufficient, which can be due to the peculiarities of the codec, the limitations of the Android version, or the incorrect settings of the MIUI shell itself. Sometimes the problem lies in the dissynchronization of volume sliders, when the system sound level is twisted to the maximum, and in the headphones themselves it remains low.

There are many software and hardware reasons why Bluetooth devices are quiet, and in this article, we will explore not only standard methods, but also the hidden capabilities of the system available to advanced users, and learn to bypass software limitations and achieve maximum sound quality.

Before you get to the tricky side of the game, you should rule out the trivial factors. Make sure that there is no separate volume button on the headset that could have been accidentally pinched, and also check if the Absolute Volume mode is activated, which sometimes works incorrectly on the bundle of Xiaomi and third-party accessories.

Basic check of pairing and synchronization settings

The first step should always be to check the standard connectivity settings. In modern versions of MIUI and HyperOS, audio management is placed in a separate menu where you can customize the behavior of each gadget in detail, and it often happens that the phone forgets user preferences after updating the firmware.

Go to Settings → Bluetooth and find your device in the paired list. Click on the gear icon or the arrow to the right of the model name. It's important to check if the Media Audio and Audio Call options are enabled. If the volume slider on this menu is omitted, even the maximum sound in the player will not give the desired result.

⚠️ Warning: If the sound is even quieter after re-pairing, try removing the device from the list and pairing again, pre-turning off and turning on Bluetooth on both gadgets.

Special attention should be paid to the function of absolute volume. In some cases, the system misreads the maximum level of the headphones. To fix this, you sometimes need to manually desynchronize the sliders: turn the volume on the phone to a minimum, then turn off Bluetooth, turn it on again and only then twist the sound to maximum.

Use of the engineering menu and developer mode

To further customize the audio path, Xiaomi has an engineering menu and special flags for developers, which allow you to interfere with the Bluetooth stack at a lower level, activating the developer mode by seven times pressing the build number in the About Phone section.

When activated in the Advanced Settings menu → There will be many hidden options for developers. We are interested in the section related to codecs and the amount of data transmitted, changing these parameters can dramatically affect the volume and quality of the audio signal.

Find Disable Absolute Volume, if it's on, try turning it off, and vice versa, which forces the system to ignore the hardware limitations of the headphones and transmit the signal at the maximum power available to the Bluetooth module.

You can also find audio test modes on the engineering menu, and the code ##6484## is often used to enter the full engineering menu in the call app, and in the Audio section you can check the speakers and microphone, and calibrate if this option is available for your model.

Customization of equalizer and sound effects MIUI

Xiaomi's shell has built-in audio processing tools that can both amplify and suppress volume. The standard equalizer often has presets that not only have the tone of the sound, but also the overall volume of the playback. Finding the optimal balance is the key to success.

Go to Settings → Sound and Vibration → Sound Effects. This is the graphic equalizer. Try to pick a Rock or Pop profile, which usually have raised low and high frequencies, which is subjectively perceived as louder sound. Manually adjusting sliders can also give you a boost of several decibels.

• 🎧 Turn on the option "Mi Sound Enhancer" - it adapts the output to the type of connected headphones.
• 🔊 Activate the Virtualizer – this will add depth, but it can lower the overall volume slightly, so adjust carefully.
• ⚖️ Check the “Sound Improvement” settings in a specific app, such as YouTube or Spotify, as they can override system settings.

Don't forget that over-amplifying certain frequencies through the equalizer can lead to wheezing and distortion, especially in budget headphone models.The dynamic range is not rubbery, and digital gain has its limits.

Third-party applications for sound amplification

If MIUI is not enough, Google Play apps come to the rescue, and they use software compression and amplification before sending it to the Bluetooth module, and the most popular and effective solution is the Precise Volume or Volume Booster GOODEV application.

The principle of their work is to create an additional layer of gain on top of the system, but be careful: setting a boost value too high (over 20-30%) can overload the earphone speaker and fail them. Digital amplification does not create energy out of nowhere, it only distorts the signal.

When using third-party boosters, it is important to give them the necessary permissions, and in newer versions of Android, this may require the inclusion of special features or the use of ADB commands to gain the necessary rights to access the audio stream.

Using these programs is always a trade-off between volume and quality. A digital signal boost above 100% always results in clipping (digital distortion), which is audible as a crackle at high frequencies.

Impact of codecs and data quality

The sound quality and volume are directly dependent on the codec used. Xiaomi smartphones support a wide range of codecs, from basic SBC to advanced aptX, aptX HD, LDAC and AAC. The basic SBC codec often cuts the dynamic range, making the sound flat and quiet.

To check and change the codec, you need to go back to the developer menu, find the item "Bluetooth audio codec." If your headphones support aptX or LDAC, forced selection of these codecs can make a lot of difference. These codecs transmit more data and have less compression.

⚠️ Warning: Forced activation of a codec that is not supported by headphones (e.g, LDAC on cheap models, will cause the sound to disappear or the connection will be constantly broken.

There's also a "Bitrate Bluetooth audio" setting on the developer menu. Increasing the bitrate (e.g., 700 kbit/s or 990 kbit/s for LDAC) allows for more rich audio, but it increases battery load and can reduce connection stability in places with a lot of radio interference.

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For maximum compatibility and volume, leave the codec selection in the "Optimum for Connection" mode so that the system chooses the best available option.

Hardware restrictions and cleaning of speakers

And don't forget the physical condition of the device, because if your Bluetooth headphones are a few years old, the speaker membrane could degrade and the mesh would get clogged with earwax or dust, and it's a natural wear and tear process that lowers the volume regardless of the phone's settings.

Carefully examine the speaker's mesh. If you see a plaque, gently clean it with a soft dry brush. Using alcohol or other liquids can damage the protective coating or get inside the housing, which will lead to a short circuit.

Sometimes the problem lies in the Bluetooth module of the smartphone, if the phone is old or dropped, the antenna module could move away. In such cases, the sound can be quiet, intermittent or interference. Checking with other headphones will help to localize the problem: if other headsets sound loud, then it is the first headphones.

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If the software methods did not help, and the headphones are old - most likely, the problem is in the physical wear of the speaker membrane, and it is impossible to fix it software.

FAQ: Frequently Asked Questions