How to increase the volume of headphones on Xiaomi Redmi 9: proven ways without risk for technology

Owners of Xiaomi Redmi 9 often face the problem of insufficient volume of headphones - the sound seems to be muted even at the maximum level. The reasons can be due to both the software limitations of MIUI and the hardware features of the model. In this article, we will discuss 7 working methods of increasing volume, from standard settings to hidden functions of the engineering menu.

It's important to understand that not all methods are equally safe. Some manipulation of system parameters can lead to sound distortion or even damage to the speakers. We marked risky methods with special warnings — be sure to read them before actions. Let's start with the simplest and safest solutions.

1. Checking basic sound settings

Before you resort to radical measures, make sure that the problem is not in the banal settings. On Redmi 9, there are several options that can artificially limit the volume:

• 🔊 Do Not Disturb Mode: Check if it is activated in the top curtain or in Settings → Sound. Even in "Alarm clocks only," system constraints can affect multimedia.
• 🎧 Individual volume setting: C Settings → Sound. → Volume is separately regulated by media, calls and alarm clocks. Make sure the headphone slider is at maximum.
• 🔄 Adaptive sound: function in Settings → Special opportunities → The sound automatically lowers the volume in noisy places. Turn it off if it's active.

It’s also worth checking the physical connection of the headphones: often oxide films on a 3.5 mm connector or contamination of Type-C contacts (in models without separate audio output) cause bad sound. Wipe the connector with a cotton swab dipped in alcohol and repeat the test.

2.Use of uniform equalizer

The built-in MIUI equalizer can significantly affect perceived volume. By default, Redmi 9 often has a preset with suppressed high and low frequencies, which creates a "muffled" effect.

1. Open the Music app (or any other place where there is an equalizer).
2. Put it on the icon. 🎛️ upper right corner during reproduction.
3. Choose a preset called Rock or Pop, which amplifies the average frequencies, making the sound subjectively louder.
4. For maximum effect, manually lift the sliders by 100 Hz, 1 kHz and 10 kHz by +3... +5 dB.

If your player doesn't have an equalizer, install the free Equalizer FX app from Google Play, which works at the system level and applies settings to all audio sources. An important caveat is that excessively amplifying low frequencies can cause the sound to be distorted on cheap headphones.

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Create a separate earphone equalizer profile and speaker – this will allow you to quickly switch between settings without manual adjustment.

3. activation of the "Loud Sound" function in MIUI

The hidden Loud Sound (or Volume Amplifier in newer versions of MIUI) feature allows you to bypass standard system constraints to enable:

1. Go to Settings. → The phone.
2. Tap 7 times on the line version of MIUI to activate the developer mode.
3. Go back to the main settings menu and open a new section for developers.
4. Find the option to turn off the absolute volume level and activate it.
5. Below will appear item Loud sound (earphones) - move the slider to the maximum.

Once this feature is activated, the volume of the headphones will increase by 20-30%, but be careful: listening at a maximum volume of more than 20 minutes in a row may cause distortion due to overloading of the speaker membranes, and we recommend using this mode only for short sessions.

4.Configure via Engineering Menu (MTK)

Xiaomi Redmi 9 is built on the MediaTek Helio G80 platform, which gives you access to an extended engineering menu, where you can manually increase the amplification of the audio chip, but this is a risky method - the wrong values can damage the hardware.

Instructions:

1. Install the MTK Engineering Mode app from Google Play.
2. Open it and select Hardware Testing → Audio.
3. In the Headset Mode, find the settings: Headset Mic Gain - don't touch! Headset Speaker Gain - increase the value from 0 to 5 (maximum 7). Headset Volume - set 160 (default 128).

Save the settings and restart the phone.

⚠️ Attention: Raising Headset Speaker Gain above 5 can cause the audio chip to overheat and automatically shut down.If wheezing or cod appears, reset your settings immediately!

5. Sound amplification applications

If the system methods did not work, you can use third-party utilities. We tested 5 popular applications and selected the most effective ones for Redmi 9:

• 🔊 Volume Booster GOODEV: It increases volume by 40 percent through software processing of sound, minus the possibility of distortion at high frequencies.
• 🎛️ Precise Volume: allows precise volume settings in 1% increments (instead of the standard 15 steps in the volume). MIUI).
• 🚀 Bass Booster: Higher frequency, which subjectively makes the sound louder. It only works with certain headphone models.

Importantly, most of these applications require access rights for special features (Settings → Special Features → Services) without which they will not be able to interact with the audio system. Also note that booster applications consume additional CPU resources, which can reduce battery life by 10-15%.

Install the application from the official store|Provide access to special opportunities|Test the sound at medium volume|Keep an eye on the temperature of your phone during use.-->

6. Checking for hardware malfunctions

If none of the software methods worked, the problem could be in the hardware, and here are the typical Redmi 9 malfunctions that affect the sound in the headphones:

• 🔌 3.5mm connector damaged: frequent problem after falls or moisture.
• 🔊 Audio chip malfunction: manifests as a quiet sound in all headphones, including Bluetooth.
• 🔋 Weak current on. USB-C (3.5mm models: If the phone does not recognize the headphones as an audio device, the volume is limited.

For diagnosis:

1. Connect the headphones to another device – if the sound is normal, the problem is with the phone.
2. Try other headphones (preferably with a microphone) – if the sound is quiet everywhere, the audio jack or chip is to blame.
3. Check if a message about a “contaminated connector” appears when you connect.

⚠️ Warning: If the phone is not supported when you connect the headphones, don’t try to fix the connector yourself! In Redmi 9, the audio track is integrated into the motherboard, and unqualified repairs can lead to complete loss of sound.

Alternative solutions

If you can’t turn up the volume, consider the following ways:

• 🎧 Headphones with amplifier: models with built-in DAC (for example, 1MORE Triple Driver gives a cleaner, louder sound.
• 🔊 Bluetooth amplifier: devices like FiiO BTR3 Connect to the phone and increase the signal power.
• 📱 Custom flashing: firmware like LineageOS or Pixel Experience has other volume limits, but that requires unlocking the bootloader and voids the warranty.

For owners of Redmi 9 with Type-C instead of 3.5 mm, we recommend Xiaomi USB-C to 3.5mm adapter with built-in amplifier. It costs ~ 500 rubles and significantly improves sound compared to the standard adapter.

FAQ: Frequent questions