Why Xiaomi has a quieter sound in one headphone: diagnostics and repairs

When the sound in one Xiaomi or Redmi headphone becomes noticeably quieter than in another, it is one of the most common complaints of users: It is not just an annoying factor that disrupts the stereo effect, but also a potential sign of an evolving malfunction of the audio codec or speaker. The volume imbalance can occur suddenly after a device drops, moisture gets in, or gradually manifest itself due to the banal contamination of the speaker’s mesh with earwax and dust.

Before you carry a gadget to a service center or buy a new headset, it is worth conducting a thorough diagnosis of software settings and the physical condition of the device. Often the problem lies not in the breakdown of audio drivers, but in a downed channel balance or software failure of the MIUI or HyperOS operating system. In this article, we will analyze all possible causes, from simple contamination to complex hardware repairs, and offer step-by-step instructions for restoring normal sound operation.

It's important to understand that ignoring this problem can lead to a complete failure of one of the playback channels, and if you notice that the volume difference increases over time, you should immediately start (find) the cause. We will look at solutions for both wired models and popular ones. TWS-AirDots and FlipBuds series headphones.

Diagnostics of hardware problems and pollution

The most common reason one earbud sounds quieter than another is because it's a physical obstacle in the way of a sound wave. TWS-The earphones are very close to the ear canal, making it vulnerable to earwax, pile from clothing and fine dust, and over time, these particles compress to form a dense plug that silences high frequencies and general volume.

Carefully inspect the speaker grid in good light, preferably using a magnifying glass or macro camera of another smartphone. If you see a yellowish or grayish plaque covering the holes, then this is likely the problem. For wired Xiaomi models with rubber embellishments, the situation is similar, but it is also worth checking the integrity of the cable at the base of the plug and the cups themselves, as the inflections could damage the internal conductors.

⚠️ Warning: Never use sharp metal objects such as needles or pins to clean the speaker mesh.You risk piercing the speaker membrane, causing the device to permanently damage and wheezing.

For safe cleaning, use a soft toothbrush slightly moistened in isopropyl alcohol or a special sticky tape for cleaning equipment. Walk around the net in a neat circular motion, trying not to push too hard. After the procedure, allow the earbag to dry completely for 10-15 minutes before turning on. If the balance has not recovered after cleaning, move to software methods.

Setting up sound balance in Android and MIUI

If a physical check shows no contamination, the next step is to check the system balance settings. In the Android operating system, which runs the MIUI and HyperOS shells, there is a hidden or explicit L/R (Left/Right) channel balance regulator. The random slider shift towards one of the channels often occurs when using the phone in your pocket or when you sloppyly connect third-party accessories.

To find this setting, go to Settings → Sound and Vibration → Sound Quality and Effects. In some firmware versions, the balance slider is placed in a separate menu, Additional Sound Settings, or is available through the disabled menu. Find the left-right-hand channel Balance and make sure the slider is strictly in the center.

Also worth checking is the activation of the Mono-audio function. If this option is enabled, the stereo signal is summed up into one channel, which can create the illusion of uneven volume or strange sound in wireless models. Turn off this feature if it is active and check the sound in the stereo track. For advanced users, access to the engineering menu through the code # # # #6484#, where you can conduct a speaker test (Right speaker / Left speaker test) and make sure that the iron is working at the driver level.

Specificity of the work of TWS-earphones and reconnection

Owners of wireless headphones Redmi AirDots, Xiaomi Buds and analogues often face desynchronization of the left and right ears. In such headsets, each headphone can work independently, and sometimes one of them goes into “mono” mode or loses some volume due to a software failure in the Bluetooth connection protocol.

The first thing to do is to perform a full headphone reset, usually by clamping the touch zones on both headphones simultaneously for 10-20 seconds (until the indicator flashes in red) or by holding the buttons on the charging case for a long time (if the model supports a case reset), after reset, you need to remove the device from the list of paired Bluetooth settings of the phone and create a pair again.

Another common problem is the uneven battery charge. If one earphone is discharged more than the other, the energy saving system can automatically reduce its volume to save energy. Make sure that both earbuds fit tightly to the contacts in the case and charge. Sometimes the oxidation of contacts on the headphones themselves or in the case prevents the full charging of one of the channels.

• 🔋 Put the headphones in the case and make sure the indicators are on, signaling a charge.
• 🔄 Remove the device from the Bluetooth list and pair again.
• 📉 Check the charge level of each headphone separately in the desktop widget.
• 🔊 Use the Xiaomi Earbuds or Mi Wear app to check for firmware updates.

If the problem persists after reconnection and charging, the battery in one of the headphones may have worn out, which is especially characteristic of models in use for more than 2 years.

Use of equalizer and third-party applications

The standard audio tuning tools in Xiaomi are sometimes limited. If the system balance doesn't work, you can try using the built-in equalizer. Go to Settings → Sound and Vibration → Equalizer. Try selecting a preset Rock or Pop, and then manually tweak the frequencies. Sometimes a software bug is solved by simply switching the equalizer mode from Off to any other and back.

For more subtle customization, there are third-party apps from Google Play, such as Volume Control Plus or Equalizer FX. These programs allow you to independently control the volume of the left and right channel with an accuracy of a percentage, which can compensate for the user's natural asymmetry in hearing or light wear of the speaker. However, it is worth remembering that third-party applications can conflict with the Dolby Atmos or Dirac system settings.

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Use the Sound Adaptation feature in Bluetooth settings if it is available for your TWS model. It analyzes the shape of the ear canal and adjusts frequencies, which sometimes eliminates the subjective feeling of silence in one ear.

Problems with audio codec and drivers

In rare cases, volume imbalances are caused by an audio codec or Bluetooth drivers malfunctioning, which can occur after an Android operating system update or MIUI betas are installed. A signal encoding failure can cause one channel to be transmitted with artifacts or a lower bitrate.

Try changing the Bluetooth codec settings in the Developer Menu. Find the Bluetooth Codec section and switch it from AAC to SBC or aptX (if supported by headphones and a phone). Sometimes forced switching to a simpler SBC codec stabilizes the connection and levels the volume.

Also on the developer menu is the option to turn off the absolute volume level. Try to change its state (turn on if it is turned off, and vice versa).This causes the Android system to not synchronize the volume of the phone and headphones rigidly, which allows you to adjust them independently and sometimes solves the problem of a quiet channel.

⚠️ Attention: The Developer Menu is designed for power users. Changing unknown parameters can cause the Bluetooth module to work unstable. Write down the changes so you can roll them back.

If none of the above works, the ultimate software method is to completely reset your phone to factory settings (Wipe Data).

When repairs are needed: signs of hardware breakdown

If the software methods and cleaning have not worked, there is likely a hardware malfunction. TWS-In headphones, the dynamic emitter itself often fails due to overload (listening at maximum volume) or moisture (sweat, rain). In wired models, the wire breaks down inside the insulation, which leads to a change in resistance and a drop in volume.

Signs indicating the need to replace the speaker or repair the board:

• 🔊 The appearance of wheezing, coding or hissing at medium volume.
• 💧 The headphone got into the water or was exposed to high humidity.
• 📉 Volume drops gradually over several months of use.
• ⚡ The headphone discharges quickly or warms up during operation.

In the case of wired headphones, Xiaomi often helps to replace the 3.5 mm plug or the section of cable at the entrance to the headphone if the problem is a cliff. For wireless models, repair is often not economically feasible due to the complexity of disassembling and adhesively connecting the cases, however, replacing the battery or cleaning the contacts sometimes brings the device back to life.

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If after resetting, cleaning and checking on another device, one earphone is still quieter, it is a physical breakdown of the speaker or amplifier that requires a replacement component.

Frequently Asked Questions (FAQ)