How to adjust the sound balance in headphones on Xiaomi Redmi 9: Step-by-step instructions

Why it is important to properly adjust the sound balance in headphones

Uneven sound in the left and right earphones is a common problem faced by owners of Xiaomi Redmi 9. This can be caused by hardware malfunctions (damage to the cable, 3.5 mm connector or Bluetooth module) and software failures in the firmware of MIUI. For example, after updating the system or connecting new headphones, the sound balance can be lost, creating discomfort when listening to music or talking on the phone.

On Redmi 9 (M2003J15SC, M2004J19C, etc.), the sound balance is adjusted through hidden developer menus or standard MIUI settings. However, not everyone knows where to look for these options. In this article, we will discuss all the available methods, from basic settings to using engineering menus and third-party applications.

Before you start changing the settings, make sure the problem isn't with the headphones themselves.

• 🔌 Connect the headphones to another device (such as a laptop or tablet).
• 🎧 Check the sound on different tracks – sometimes the asymmetry of the sound is embedded in the mix of the song.
• 🔄 Reconnect the headphones to Redmi 9, clearing the connector from dust.

Method 1: Balance adjustment using standard MIUI parameters

MIUI 12/13/14 firmware for Redmi 9 has built-in audio adjustment tools, but they're hidden in a special feature menu, which works for both wired and Bluetooth headphones.

To change the balance:

1. Open the Settings. → Special facilities.
2. Go to the section "Hearing". → Audio balance.
3. Move the slider between the left and right channels to level the volume.
4. Press Save and check the sound.

If the Audio Balance partition is missing, then your version of MIUI does not support this function directly, in which case move on to the following ways.

Method 2: Use of an engineering menu (for advanced users)

The Engineering Mode allows you to fine-tune sound settings, including channel balance, equalizer and signal amplification. On Xiaomi Redmi 9, this menu is accessed via hidden code ##36446337##, but it may not work on some versions of MIUI. An alternative way is to use the MTK Engineering Mode app (for the MediaTek Helio G80 chips that are on Redmi 9).

Instructions:

1. Install the MTK Engineering Mode app from Google Play.
2. Open it and go to the Hardware Testing → Audio section.
3. Select Normal Mode and test each channel (Headset for wired headphones, Bluetooth for wireless).
4. In Volume, adjust the volume for the left and right channels separately.

⚠️ Warning: Do not change the settings in the engineering menu unless you are sure of their purpose. Incorrect settings can lead to distortion of sound or failure of audio drivers.

Method 3: Third-party applications for sound adjustment

If the built-in MIUI tools don't work, use specialized applications that offer advanced equalizer settings, channel balance, and even surround sound simulations.

Top.-3 Applications for Xiaomi Redmi 9:

• 🎛️ Equalizer FX — Supports separate setting of the left / right channel, presets for different genres of music.
• 🔊 Wavelet – uses algorithms for correcting sound for specific models of headphones (including budget).
• 🎧 ViPER4Android — The most powerful solution with Bluetooth support and USB-C audio (requires root rights for full functionality).

To install ViPER4Android on Redmi 9 without root:

1. Download APK from ViPER's Audio's official website.
2. Install the ViPER4Android FX app and driver.
3. In the settings, turn on Compatibility Mode and restart the smartphone.
4. Open ViPER4Android, go to Headphone and adjust the balance in the Channel Pan section.

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If the sound is lost after installing ViPER4Android, check if MIUI Optimizations blocks it. Turn off the optimization for the application in the battery settings.

Diagnostics of hardware problems

If software methods fail, the problem may be physical malfunctions:

• 🔌 3.5mm connector: contact oxidation or mechanical damage, check if the plug is wobbly when connected.
• 🎧 The headphone cable is most often rubbed at the base of the plug. Try to bend the wire slightly at this point while playing the sound.
• 📱 Smartphone audio chip – when falling or getting moisture can fail, in which case the sound will be distorted or disappear in both channels.

To check the 3.5 mm connector:

1. Connect the headphones and start playing music.
2. Carefully swing the plug left-right. If you hear a sound, it disappears, the problem is the connector.
3. Try cleaning the nest with a toothpick soaked in alcohol (do not use metal objects!).

⚠️ Warning: If the sound is not restored after cleaning the connector, do not try to disassemble the smartphone yourself. On Redmi 9, the audio chip is soldered to the motherboard, and its replacement requires soldering equipment.

Balance setting for Bluetooth headphones

On Xiaomi Redmi 9, the audio balance for Bluetooth devices is configured differently than for wired ones, which is because the A2DP protocol (used for audio transfer) does not always support separate channel adjustment at the smartphone level.

1. Customization in the Bluetooth device itself. Many headphones (e.g. Xiaomi AirDots or Redmi Buds) have their own audio management app. Install it and check the balance settings.

2.Using equalizer apps. Wavelet or Equalizer FX can adjust the sound even for Bluetooth, but with limitations (depending on the MIUI version).

3. Reset Bluetooth settings. Sometimes the connection failures lead to distortion of the sound.

Settings → Connections → Bluetooth → Click on the gear icon next to the headphones → Forget the device

Then re-set the headphones.

Frequent Mistakes and How to Avoid Them

When adjusting the sound balance, Xiaomi Redmi 9 users often make typical mistakes that only exacerbate the problem:

• 🔇 In the pursuit of pure sound in the headphones, some people turn off the system sounds. MIUI Sound Effects in the developer settings, which can lead to the complete disappearance of the sound.
• 🔊 Excessive bass amplification: In equalizer apps, lower frequency increases on weak headphones cause distortions that mask channel imbalances.
• 🔄 Ignoring updates. New versions MIUI They often fix bugs with sound. Check for updates in Settings → The phone. → Updating the system.

Another common problem is application conflict: If you have multiple equalizers (like ViPER4Android + Equalizer FX), they can lock each other out, leave just one app and restart your smartphone.

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Before installing third-party equalizers, turn off the built-in MIUI equalizer in the sound settings to avoid conflicts.

FAQ: Answers to Frequent Questions