How to increase the volume of headphones on Xiaomi Redmi 9T: the full guide

Owners of the popular smartphone Xiaomi Redmi 9T Often, people are faced with situations where the standard volume of the built-in speakers or connected headphones is not enough, this can be due to the peculiarities of the user's perception of sound, poor quality audio files, or even design limitations of the hardware. But the software shell MIUI, installed on the device, provides a wide range of tools for fine tuning the audio stream.

Before you go to radical methods, such as using third-party applications or changing system files, it is worth exhaustively studying the standard features of the system. Many users simply do not know that there are hidden settings of the equalizer or the Dolby Atmos feature, which by default can be disabled or configured incorrectly. A competent combination of regular tools often gives a volume increase of 20-30%, which is quite enough for comfortable listening to music or watching videos.

In this article, we will take a look at all the ways you can amplify your sound on the Redmi 9T, from basic adjustment sliders to advanced methods through the engineering menu. You will learn how to adjust the frequencies correctly so that the sound is not only louder but also cleaner, while avoiding wheezing and distortion.

Basic sound setting and Dolby Atmos function

The first step to improving the audio experience should be to carefully study the standard audio settings menu. In Xiaomi smartphones, the Settings → Sound and Vibration section is responsible for this. This is where the basic controls are often ignored. Pay special attention to the Dolby Atmos switch. This surround sound technology not only creates an immersive effect, but also has a built-in compressor that can significantly increase the overall volume of quiet tracks.

Activation of Dolby Atmos gives access to additional profiles such as Dynamic, Movie, Music and Voice. Dynamic is the best way to maximize volume, as it automatically adapts the sound scene to the content, squeezing the maximum out of the available volume range.

• 🎧 Include the Dolby Atmos switch in the audio settings menu to activate advanced processing algorithms.
• 🔊 Select the Dynamic or Music profile to get the loudest and most intense sound.
• 📱 Make sure that the Bluetooth settings (if wireless headphones are used) activate the codec. AAC or aptX for better data transfer.
• ⚙️ Check if Quiet or Do Not Disturb mode is enabled, which can programmatically limit peak volume.

It's important to understand that Dolby Atmos isn't just a marketing ploy, it's a real-world digital signal processing (DSP) tool. On the Snapdragon 662 processor that's installed in the Redmi 9T, it works fairly consistently, without causing a noticeable increase in power consumption. If the sound is too sharp after turning on this feature, try manually adjusting the equalizer sliders to reduce the high frequencies.

⚠️ Warning: Long-term listening to sound at maximum volume with Dolby Atmos on can lead to rapid hearing fatigue and even temporary decrease in auditory sensitivity.

Use of the built-in equalizer Mi Sound

The second powerful tool in the Xiaomi Redmi 9T user’s arsenal is the Mi Sound built-in equalizer. You can find it by Settings → Sound and Vibration → Sound Effects. Unlike simple timbre regulators, here’s a graphic curve that allows you to change the volume level for specific frequency bands. The right tuning of these sliders can do wonders by adding the missing power where it is needed.

To increase the overall volume, it is recommended to use what is called a "smile" or light lift of all frequencies, but with caution. By raising all the sliders of the equalizer by 3-5 dB, you can achieve a noticeable increase in the signal level. However, if you raise them too high, the digital signal will go into "clipping", which will manifest itself in the form of unpleasant cracking and wheezing, especially on bass. So Mi Sound requires a careful approach.

💡

Try preset "Bright" or "Juicy" in the Mi Sound settings if manual tuning seems too difficult. These profiles already contain amplified frequencies for higher volume.

It is worth noting that equalizer settings can be reset when you upgrade or reset your phone. It is recommended to take a screenshot of the successful slider configuration to quickly restore your preferred profile if necessary. In addition, some third-party music players may ignore the system settings of Mi Sound, so check the volume in the application you use most often.

The efficiency of the Mi Sound depends on the quality of the acoustics connected. Cheap earphones with small speakers may not cope with the amplified low frequencies and start rattling, in which case it is better to focus on medium and high frequencies, where the human ear is most sensitive, which is subjectively perceived as increasing the volume without risking damage to the speaker membrane.

Configure Bluetooth codecs and developer

Wireless headsets offer additional options through the developer menu. Standard Bluetooth settings in Android often use high-compression codecs to ensure connection stability, which can negatively affect volume and sound quality. Redmi 9T allows you to force a higher-quality codec if your headphones support it.

To get into the developer menu, you need to quickly click on the build number 7 times in the About Phone section. Once the corresponding notification appears, go to Advanced Settings → For developers. Find the Bluetooth section and look for the Bluetooth Codec. Changing the value from SBC to AAC or aptX (if available) can improve audio streaming.

Also on the developer menu is the option Absolute Volume Level. Try to change the volume level (on or off). In some cases, the desynchronization of the volume of the phone and headphones is solved by switching this setting. If the volume slider on the phone does not fully unlock the potential of the headphones, this setting can allow them to synchronize their levels.

Keep in mind that choosing a better codec can slightly increase battery consumption, as the Snapdragon processor will have to process the audio stream more actively. However, in practice, the difference in the autonomy of the Redmi 9T with its capacious battery will be almost invisible in normal use.

Engineering menu and deep calibration

For advanced users who are not comfortable with standard methods, there is an access to the engineering menu, which is a hidden part of the system, designed to test hardware components, in particular, we are interested in the section responsible for audio, access to it by typing in the phone book a special code, for example, # # #3646633# (code may vary depending on the firmware version and region).

Once you're in the Engineer Mode menu, you go to the Hardware Testing tab, then you select Audio and then Audio Debug. You can find the amplification settings for different scenarios: Headset, Handset, Speaker, and Headset. We're interested in the headphone section. Inside you can find Gain settings for different volume levels (Level 0-6).

By increasing the values in the Digital Gain column, you can add a few decibels to the maximum volume. However, here lies the main danger: exceeding the permissible values can burn the speaker coil in the headphones or cause severe distortion. It is recommended to increase the values by no more than 3-5 units at a time and immediately check the result.

⚠️ Warning: You make any changes to the engineering menu at your own risk, write down the initial values before the change so you can roll back in case of wheezing or loss of sound.

It is worth mentioning that in new versions of MIUI, access to some functions of the engineering menu can be limited or closed. If the code does not work or sections are blocked, then the manufacturer has blocked this method for ordinary users, in which case you should not look for third-party applications to open hidden menus, as they may contain malicious code.

Third-party sound amplifiers

If the built-in tools are not enough, applications from the Google Play Store come to the rescue. There are many equalizers and amplifiers, such as the Volume Booster GOODEV, Bass Booster or Equalizer FX. These applications work on top of the system audio stream, further amplifying the signal before it is sent to the output.

The way they do it is simple: they intercept the audio signal and apply digital amplification (Gain) to it, which allows them to exceed the standard limit of 100% set by the manufacturer. But there is a downside to this method: digital amplification always causes distortions. The higher the amplification percentage you put, the worse the sound quality becomes, digital artifacts appear and wheezing.

• 📲 Volume Booster is a simple app with one slider, allowing you to add up to 60% volume.
• 🎚️ Precise Volume is a more advanced tool with up to 100 steps and profiles for different applications.
• 🎵 Poweramp Equalizer – professional equalizer with the ability to fine tune frequencies and built-in amplifier.
• 🔊 Flat Equalizer is a lightweight, ad-free option that does a good job of basic signal amplification.

Using third-party software requires permanent permissions to access the microphone or modify the system's audio settings. When installing such an application, carefully read the permissions requested. Some "amplifiers" can collect data about what you are listening to, so it is better to choose programs with good ratings and a large number of reviews.

💡

Third-party amplifiers are a trade-off between volume and quality. Use them only when the Redmi 9T's standard facilities are severely under-utilized, and don't maximize the amplification.

Physical Causes of Silent Sound and Their Removal

Often, the problem with quiet sound is not software, but simple physics. In six months or a year of use, a speaker grid or 3.5 mm connector (if you use wired headphones) accumulates dust, earwax and pile from your pockets, which creates a mechanical obstacle to the sound wave, silences the sound.

For diagnosis, try gently cleaning the earphone speaker with a soft dry toothbrush or using a special Velcro to clean the appliances. If you use a mini-jack connector, you can try blowing it with compressed air. Often after such a simple procedure, the sound becomes noticeably cleaner and louder, returning to factory performance.

It's also worth checking the integrity of the headphone cable. Clutching, twisting and breaking at the plug or at the cups themselves can lead to increased resistance, which directly affects the volume. Try connecting other headphones to the Redmi 9T. If they sound loud, then it means that the problem is in your headset, not in your smartphone.

⚠️ Warning: Never use sharp metal objects (needles, pins) to clean the earphone speaker or phone jack.You may damage the safety net or close contacts, which will lead to breakage.

Frequently Asked Questions (FAQ)