How to increase the volume of Bluetooth headphones on Xiaomi

Owners of Xiaomi, Redmi and POCO smartphones often face situations where the sound level in wireless headsets does not seem high enough, especially in noisy places such as public transport or busy streets where standard power is simply not enough, and the problem may lie in the software limitations of the MIUI or HyperOS operating system, as well as in the features of the Bluetooth protocol itself.

Fortunately, most of these limitations can be circumvented without obtaining superuser rights. In this article, we will look at proven methods that will help you squeeze maximum decibels out of your acoustic system.

Before you get to the tricky part, you need to check the basics, and sometimes the solution is to simply switch the codec or turn off the function that synchronizes the volume of the phone and the headphones, and absolute volume is the one that most often causes quiet.

Check basic sound settings and connected device

The first thing you need to do is make sure that the problem is not caused by the trivial desynchronization of volume sliders. Xiaomi devices have a system where media volume and Bluetooth volume can be adjusted separately or linked. Try playing the track and, without turning off the music, swipe the volume slider several times from minimum to maximum.

Also worth paying attention to the physical cleanliness of the speakers. The headphone mesh eventually gets clogged with earwax and dust, which can reduce the output power of the sound by 20-30%. Carefully clean the mesh with a soft dry brush. If it's the software part, you should find the Sound and Vibration section in the Settings menu and check if the Mono-Audio mode is activated, which sometimes distributes channels incorrectly.

It’s important to check if your device model is correctly defined by the system. In some cases, Android mistakenly classifies the headset by applying the wrong volume profile.

⚠️ Warning: Do not try to clean speakers with sharp metal objects or cotton swabs, pushing dirt inside. This can damage the speaker membrane and permanently spoil the sound.

Make sure the headphones themselves are not limited. Some models have their own companion apps where you can adjust the equalizer or select a sound mode, such as Bass or Clear Voice, which will subjectively increase the perceived volume.

Turning off the absolute volume of Bluetooth

One of the most powerful techniques is to turn off the absolute volume function, which forces the phone to transfer control of the sound level completely to the headset. If the headphones have their own limit, the phone can not exceed it. Disabling this feature untied the hands of the Android system, allowing you to adjust the signal amplification independently.

To do this, you'll need access to the developer menu. Don't be afraid of this name: it's a standard partition designed for debugging, but useful for regular users. To activate the menu, go to Settings → About phone and quickly click 7 times on the line MIUI Version (or OS Version). Once you have the message "You're a developer", go back to the main settings menu.

Now, look for Additional (or Advanced Settings) and select Developer For. In the list that opens up, which is quite extensive, you scroll down to Network or Bluetooth. Find a switch called Disable Absolute Volume and activate it.

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After the change of settings, be sure to restart the smartphone and reconnect the Bluetooth headphones so that the changes take effect.Without a reboot, the system can use old profiles.

Once you reboot, reconnect the headset, and you'll notice that the volume slider on the phone is now running independently, try setting the maximum value on the phone, and if the headphones have a physical button or touch control, also spin the volume on them to the end, which often gives you a 10-15 percent increase.

Use of engineering menus and codes

A deeper level of customization is available through Xiaomi’s engineering menu, which allows you to adjust the parameters of audio drivers directly at the iron level. To enter the menu, you use a special system code that runs on most MediaTek processors and some Snapdragon processors.

Open the Phone app and type ##3646633#. If the code didn't work, try ##4636##, although the latter option often leads to the standard test menu. In the Engineer Mode interface that opens, go to the Hardware Testing tab, then select Audio → Audio Debugging.

Here you'll see several modes: Normal Mode (normal), Headset Mode (headset) and Handsfree Mode (loudswire). We're interested in Headset Mode or Headfree Mode, depending on your headset type. Inside, select the Media script type (playback).

In the window that opens, look for a Level slider. There can be several of them (Level 0, Level 1, etc.), they correspond to the volume steps on the phone. Choose the maximum level (usually Level 6 or 7) and set the value in the Max Vol field. The standard value is often 135 or 150. You can try to increase it to 160, but do not exceed 200 so as not to burn the speakers.

Once you set the values, press Set or Apply. Changes apply instantly. Check the sound. If it starts to wheez, reduce the value by 5-10 units. This is a fine-tuning that requires accuracy.

Third-party applications for sound amplification

If there's not enough built-in tools, Google Play apps that use system APIs to program audio pumping come to the rescue, and they create an extra layer of signal amplification before sending it to a Bluetooth module, and one of the most popular and effective solutions is the Volume Booster GOODEV app.

The way these programs work is simple: they add their gain slider on top of the system, but it doesn't add new energy to the signal, it just increases the amplitude of the digital wave, which can lead to distortions (clipping) at high values.

• 🎧 Volume Booster GOODEV — Simple interface, the ability to configure the boost up to 60%, works on top of all applications.
• 🎚️ Super Volume Booster – has a built-in equalizer and Bass Boost function, which allows you not only to make the sound louder, but also richer.
• 🔊 Boom: Bass Booster & Equalizer is a more advanced tool with a new version. 3D-sound and many presets, but many functions are paid.

When using these amplifiers, it is critically important not to set the boost value to a maximum (100%); start at 10-20% and gradually increase until the sound is comfortable; exceeding the safe limit can lead to irreversible damage to the speaker membrane in the headphones.

⚠️ Warning: Long-term listening to high volume sound through software boosters can lead to rapid degradation of sound quality and the appearance of constant wheezing in speakers.

There are also applications that specialize in fine-tuning the equalizer, like Poweramp Equalizer, that allow you to lift all frequency sliders upwards, creating an effect.

Flat + Gain

Change Bluetooth codec and bitrade

The quality and volume of the transmitted sound depends on the chosen codec. Xiaomi in their devices supports a wide range of codecs: SBC, AAC, aptX, aptX HD, LDAC. By default, the system often chooses the most compatible, but not the loudest or highest quality codec - usually SBC or AAC.

Go back to the developer menu I mentioned earlier. Find the Bluetooth Audio Codec section. Try switching from SBC to aptX (if your headphones support this standard). The aptX codec often provides higher dynamic range and better low-frequency transmission, which subjectively makes the sound louder and more powerful.

In addition, the developer menu has a setting called “Bitrate of Bluetooth audio system.” Set the maximum possible value (for example, 990 kbit / s for LDAC or 352 kbit / s for aptX HD), if the connection stability allows. Higher bitrate transmits more data, including volume peaks, which can be cut off with low compression quality.

It is worth noting that some codecs, such as LDAC, in connection quality priority mode can reduce bitrate dynamically, which affects sound. In LDAC settings (if there is a separate item), select the "Sound Quality Priority" mode.

Comparison of volume-raising techniques

To make it easier for you to choose the right method, we have organized the methods in a table, each of which has its own advantages and risks that must be considered before using.

As you can see from the table, the safest method is to turn off absolute volume. The engineering menu gives the best result, but requires caution. Boost applications are "heavy artillery" that should be used only in extreme cases and with an understanding of the risks.

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A combination of methods (e.g., turning off absolute volume + light boost through the equalizer) often yields a better result than aggressively using a single instrument.

Frequent problems and their solution

Even after all the settings, there can be specific problems, such as loudness but intermittent sound, this indicates interference in the radio channel or low battery charge of the headphones, make sure that there are no thick walls or working microwave ovens between the phone and the headset.

Another common problem is that only one particular app has a quiet sound (like YouTube or Telegram), in which case, check the volume settings inside the app itself, as they can override system values.

If the sound starts to wheez after settings in the engineering menu, immediately reset the audio settings to factory. Engineer Mode menu often has a Default or Reset button. You can also perform a full reset of the phone settings, but this is a last resort.

In some cases, a quiet sound is a sign of a hardware malfunction in the headphone battery. When the battery degrades, it can't give up the current needed to create a powerful sound wave, and the sound becomes quiet and "sluggish."

FAQ: Frequently Asked Questions