How to increase volume on Xiaomi Redmi 9T: the complete guide

Xiaomi Redmi 9T has proven to be a reliable budget device with a powerful battery and a high-quality display, but many users often face limitations in the sound system. Standard volume speaker may be lacking in noisy places, such as public transport, a busy street or when watching videos in poor acoustic conditions. This is a common problem for many models of the mid-range segment, where manufacturers are trying to save on components, but software methods can significantly improve the situation.

There are many ways to get around the software limitations of the MIUI operating system and make the most of the hardware available. In this article, we will look at both secure settings inside the system and more advanced methods that require caution. You will learn how to configure the equalizer, use the hidden functions of engineers and what applications can really help in this situation without harming the device.

Before you start taking drastic measures, you need to understand that maximum volume is a balance between sound quality and the risk of damage to the speaker. Software amplification can lead to signal distortion or wheezing if the speakers are not designed for such loads. So it is recommended to move from simple settings to complex, monitoring the result at each stage, so as not to harm the audio codec of your smartphone.

Basic Sound and Multimedia settings

The first step should always be to carefully check the standard settings, as often the problem lies in forgotten restrictions or specific profiles. Android and the MIUI shell allow you to separately adjust the volume for different types of content, and sometimes the medial slider is kept at a minimum while the volume of the call is twisted to the maximum.

Go to the settings menu and select Sound and Vibration, and here you'll see several scales for different use cases. Make sure that the Media slider is raised to the point, because it's responsible for playing YouTube videos, movies, games and music, and check if No Sound or Do Not Disturb mode is activated, which can block audio notifications.

In the same menu, you should pay attention to the Sound Improvement feature if it is available in your firmware version. Often the default mode is Original or Balance, but switching to Bright or Saturated can subjectively increase the perceived volume by increasing the high frequencies.

• 🔊 Check separate volume control for calls, notifications and multimedia.
• 🎛️ Activate the “Sound Improvement” mode in the settings for a more saturated sound.
• 🔇 Make sure that the smartphone body does not stick the volume button.
• 📱 Clean the mesh of speakers from dust using a soft brush or sticky tape.

⚠️ Warning: If the sound is quieter after hitting the device in water or in the rain, do not immediately try to twist the volume to maximum - this can cause a short circuit in the speaker.

Use of the built-in Dolby Atmos equalizer

One of the key features of the Redmi 9T is the presence of Dolby Atmos surround sound technology. This is not just a marketing move, but a full-fledged audio stream processing tool that allows you not only to create the effect of spatial sound, but also significantly increase the overall volume of playback.

To access these settings, go to Settings, then select Sound and Vibration, and find Dolby Atmos. You need to switch the main switch to the active position. The system will prompt you to select a profile, and Automatic or Dynamic is the best option for maximum volume.

You can manually adjust the equalizer in detail, and if you lift the sliders of all frequency bands up, you can get a significant increase in volume, but be careful: raising the low frequencies too much can cause the body to resonate and rattle, which will worsen the overall perception.

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For watching movies, the best fit is the “Cinema” profile, which optimizes the dialogue and makes them more legible even at high volume.

It is important to understand that Dolby Atmos uses additional processing resources. While the Snapdragon 662 installed in the Redmi 9T has minimal load, in rare cases, when using heavy games, turning on this feature can lead to micro-sound delays.

Engineering menu for calibration of audio system

The most effective, but also the most risky, method is to use the engineering menu, which is a hidden part of the system that's designed to test equipment by engineers in the factory, where you can directly control (amplify) audio tracks, bypassing the standard limitations of the MIUI shell.

To enter the engineering menu, open the Phone app and dial the combination ##3646633##. If the code didn't work, your firmware version may block this access and you will need to install a special assistant app from the Play Market store, such as "Engineer Mode MTK." After logging in, go to the Hardware Testing tab and select Audio.

In the menu that opens, you'll see a few categories: AudioDebug, AudioList, and others. We're interested in the AudioList or Speech Enhancement section. Here, you'll find the media volume setting (often referred to as Media or Music), and if you zoom in on the Level or Gain column, you'll be able to make the sound louder.

⚠️ Warning: Changing the parameters in the engineering menu is at your own risk. Incorrect setting of the gain can lead to irreversible burnout of the speaker or the appearance of constant background noise (cracking).

It's recommended that you write down the initial values before any change so you can go back to them. Don't raise the values more than 3-6 dB at a time, checking the result. Digital amplification has a limit, after which clipping begins - distortion of the sine wave tops of the sound signal, which sounds like an unpleasant crackle.

Third-party amplifiers

If you don't want to mess around with system settings, Google Play apps that are designed specifically to amplify sound come to the rescue, and they work on the principle of a software equalizer that intercepts the audio stream and raises its level before sending it to the output. The most popular and proven solution is the Volume Booster GOODEV application.

The way these programs work is simple: they add an additional gain cascade. Once you install the app, launch it and start raising the Boost slider. The interface usually warns of risks when you exceed the 20-30% mark. For the Redmi 9T, the safe limit is a value of 20-25%, above which there is a noticeable degradation of quality.

There are more advanced alternatives, like Precise Volume or Equalizer FX, which allow you to create profiles for different applications, for example, you can set a 10% amplification for YouTube, but disable it for system sounds so that the keyboard click does not stun you.

• 🚀 Volume Booster GOODEV — simple solution with one gain slider.
• 🎚️ Equalizer FX — powerful equalizer with support for presets and booster.
• 🔊 Precise Volume – fine volume setting with 1% increments instead of the standard 15%.
• 🎵 Boom: Bass Booster & Equalizer – an app for improving bass and overall volume.

The processor is forced to constantly process the audio stream in real time, which can lead to faster battery discharge, although on the Redmi 9T with its capacious battery this will not be as noticeable.

The effect of Bluetooth codecs on volume

When connecting wireless headphones or speakers, the volume depends not only on the smartphone, but also on the data protocol used. Xiaomi Redmi 9T supports Bluetooth 5.0, which provides a stable connection, but the choice of codec can significantly affect the final signal level.

In the developer settings (available after 7 taps on the build number in About Phone), you can find the option “Bluetoothoothooth audio codec”. By default, SBC is often the basic codec with minimal quality and volume. Switching to aptX or aptX HD (if supported by your playback device) can change the nature of the sound.

However, sometimes the problem is to de-synchronize the volume levels between the phone and the headphones, and in this case, the pairing reset procedure helps: remove the device from the Bluetooth list, turn it off, then turn it on again and pair it again. It is also useful to check whether the Absolute Volume feature is included in the developer menu.

Cleaning the speakers from pollution

Often the silent sound is caused by a banal physical barrier, the Redmi 9T speaker grid is located at the bottom of the body and at the top end (talk speaker), which eventually fills with dust from pockets, pile from clothes and skin fat, which clogs the holes.

You can use a soft toothbrush with dry bristles to clean it, and carefully, without pressing too much, walk down the net and sweep the dust out, and a more effective method is to use a special cleaning clay or a sticky tape that pulls the dirt out of the depths.

Some users use the "blow" method, but do it with the mouth is strictly impossible because of moisture in the exhaled air. It is better to use a can of compressed air, designed to clean electronics, keeping a distance so as not to damage the membrane of the speaker with a jet.

FAQ: Frequently Asked Questions

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An integrated approach – a combination of cleaning speakers, adjusting the equalizer and moderate use of boosters – will give the best result without risk to the device.