Budget users TWS-The Redmi AirDots 2 (also known as the Mi True Wireless Earbuds Basic S) is no exception, despite its popularity and availability. Owners of Xiaomi and Redmi gadgets notice that even with the most sliders twisted on the Android system, the audio does not sound powerful enough, especially compared to wired analogues or more expensive models.
The problem lies not only in the hardware limitations of speakers, but also in the software algorithms for hearing protection, which are built into the shell of MIUI and the Android operating system. Volume limiters are designed to protect users' ears, but in the realities of the subway, street or gym, their work becomes an annoyance. Fortunately, the Xiaomi ecosystem provides fairly flexible tools for fine-tuning the audio output, allowing you to bypass standard limits without losing sound quality.
In this guide, we’ll look at all the ways you can amplify your sound, from basic Bluetooth settings to hidden engineering menus, how to set the equalizer correctly, activate the absolute volume function, and what third-party applications can help you do that. It’s important to approach the process in a holistic manner, as often the best results are achieved by combining multiple tuning methods.
Checking basic settings and pairing
Before you go to the complex manipulation of system files or engineering codes, you need to make sure that the basic connection is correct. Often quiet sound is the result of dissynchronizing the volume levels between the smartphone and the headphones themselves. Make sure that the Bluetooth menu of your Xiaomi or Redmi device displays the full volume scale for the connected accessory.
Sometimes the Android system separates the volume control of the media and the volume control of the Bluetooth device. To fix this, try pressing the volume button on the smartphone body several times while playing audio until you reach the maximum, and then repeat the action using the physical buttons on the AirDots 2 itself (if the model supports adjustment) or through the player control widget.
⚠️ Warning: If the sound is still quiet after re-conjugating and checking the sliders, the problem may be contamination of the sound grid. Carefully inspect the speakers for earwax or dust that may physically block the output of the sound.
It’s also worth checking if the Bluetooth settings are activated with Absolute Volume. In some versions of MIUI, disabling this feature allows you to separate the volume of the phone and headphones, which sometimes gives you a gain in decibels. To do this, go to the developer menu, which we’ll talk about below, and find the corresponding switch.
☑️ Diagnostics of sound
Activation of the Developer Mode in MIUI
A key step in expanding the capabilities of the audio system is access to hidden Android settings. In Xiaomi smartphones, this section is hidden by default to protect inexperienced users from accidental changes in critical settings. First, you need to activate the developer mode by performing a series of quick clicks.
Go to the Settings menu and select About Phone. Find the MIUI version and quickly click on it 7-10 times in a row. The system will tell you that you have become a developer. Then a new Developers option will appear in the main settings menu, in the "Additional" section. This is where the important Bluetooth protocol controls are located.
Inside the developer menu, scroll down to the "Network" or "Bluetooth" section. We're interested in the "Disable absolute volume" option. Experimentally check both states of this switch. Turning on or off this feature changes the logic of how the smartphone and headphones interact, which in some cases removes software volume restrictions.
Why does it work?
Remember to fully reboot your smartphone and reconnect Redmi AirDots 2 after changing your settings. The changes only come into effect after you shake hands again using Bluetooth.
Setup of system equalizer and sound effects
The MIUI has built-in audio processing tools that users often ignore. The standard equalizer allows not only frequency adjustments, but also preset profiles that increase overall sound pressure. Go to Settings → Sound and Vibration → Sound Effects.
In the Graphic Equalizer section, you'll see frequency sliders. To increase perceived volume, it's recommended to slightly raise the low (bass) and high frequencies, creating what's called a "smile." However, beware: lifting all sliders up too much will lead to digital distortion and wheezing. The optimal solution is to choose a Rock or Pop profile, which initially have a more aggressive gain curve.
- 🎚️ Bass: Lift the first two sliders on 2-3 division.
- 🎼 Mid-frequency: Leave unchanged or lower slightly to highlight vocals.
- 🔊 High frequencies: Lift the last sliders to add detail and "air".
Also on this menu is often the option "Mi Sound Enhancer" or "Enhance Sound" and enabling this feature activates additional post-processing algorithms that can dynamically increase the volume of quiet sections of the track. Try switching the "Hearphones" and "Dynamics" modes to find the most suitable algorithm for your AirDots model.
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Use the Adaptive Sound feature in Bluetooth settings, if available. It automatically analyzes the contents of the track and adjusts the equalizer in real time, which often gives a better result than static settings.
Use of third-party amplifiers
If the built-in tools aren't enough, specialized applications from the Google Play Store come to the rescue, and they work on top of the system mixer, software-enhanced audio stream before it is sent to the Bluetooth module. One of the most popular and effective solutions is the Volume Booster GOODEV app or analogues.
The way these utilities work is simple: they add an extra gain (Boost) to the signal. The interface is usually a single slider. It's important to understand that increasing the value above 20-30% can overload the speakers and cause unpleasant wheezing. Digital amplification does not create new energy, it just makes the speakers work to the limit.
Another powerful tool is the Precise Volume app, which allows you to create complex volume profiles for different use cases. You can set up a separate maximum volume profile specifically for Redmi AirDots 2, which will activate automatically when you connect the headset.
⚠️ Attention: Prolonged use of software boosters at maximum power can cause overheating and physical damage to the speakers membranes in the headphones. Use the gain moderately, without exceeding the value 30-40%.
When installing these applications, be sure to check the permissions requested. To work properly, they require access to system audio settings and, in some cases, rights to display over other windows.
Comparison of volume-increasing methods
To make it easier for you to choose the right method, we have compiled a comparative table of the main ways to increase volume, each of which has its advantages and disadvantages, which should be considered depending on your situation and technical literacy.
| Method | Efficiency | Risk for the speakers | Difficulty setting up |
|---|---|---|---|
| Basic Bluetooth settings | Low. | Absent. | Minimum |
| Developer Mode (Absolute Volume) | Medium | Low. | Medium |
| MIUI System Equalizer | Medium | Low. | Low. |
| Booster applications | Tall. | High-pitched | Low. |
As you can see from the table, the safest way is to combine equalizer and developer mode settings. Using third-party boosters is the most effective, but requires caution. The best solution for daily use is to fine-tune the built-in MIUI equalizer in conjunction with the right audio codec.
Also, remember to use audio codecs: You can choose a priority codec (SBC, AAC, aptX) from the developer menu. Although Redmi AirDots 2 supports mostly basic codecs, the forced selection of SBC sometimes gives a more "direct" and loud signal than AAC on some versions of Android.
Engineering menus and hidden commands
For advanced users, there is access to the engineering menu through special USSD-This method allows you to directly interfere with the audio track of the smartphone, but be very careful: the wrong settings can lead to unstable sound throughout the system.
Type in the code ##3646633## or #4636##. If the code is suitable for your version of the processor and firmware, the Engineering Mode menu will open. Go to the Hardware Testing tab → Audio → Audio Debug.
Here you will see a list of scenarios (Scenario) such as "Normal", "Headset", "Handsfree". Select "Headset" (as TWS headphones are often classified by the system as a headset). In the "Type" section, select "Speech" or "Media" (whichever is quieter). The "Digital Gain" option is responsible for digital amplification. It can be increased, but it is not recommended to put a value above 150-160, as severe distortions will begin.
The path on the engineering menu:
Hardware Testing -> Audio -> Audio Debug ->
Scenario: Headset -> Type: Media -> Level: 0-6 -> Digital Gain⚠️ Warning: The engineering menu is for service engineers, changing unknown parameters can cause the sound to disappear completely. Write down the baseline values before making any changes so you can roll back.
When you change the settings, press the Set button and check the result. If the sound is cleaner and louder, you can leave the setting. If you have a whistle or a crackle, return the default values immediately.
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The engineering menu gives you the deepest control over sound, but it requires high accuracy. For most users, it's safer to limit yourself to equalizer settings and developer mode.