Why Xiaomi Redmi Note 8 Pro itself is downgraded sound – all the reasons and how to fix it

The problem of spontaneously reducing the volume on the Xiaomi Redmi Note 8 Pro is one of the most common complaints of users of this model. The smartphone, released in 2019, is still popular thanks to the powerful Mediatek Helio G90T processor and stereo speakers, but its software sometimes behaves unpredictable, owners note that the volume drops both during listening to music, and when talking, video or games – and this happens for no apparent reason.

Most of the time, the faulty interface between the hardware and the software is to blame, but sometimes the problem goes deeper, either in physical damage or in outdated drivers. In this article, we'll look at all the possible causes, from trivial settings to hidden MIUI bugs, and give step-by-step instructions for diagnosing and troubleshooting. If you've tried to reboot your phone or reset your audio settings, don't rush it to the service: 90% of the time, you can solve the problem yourself.

First, identify the situations in which the volume drops, which will help narrow down the possible causes:

• 🎵 While listening to music (including Spotify, YouTube Music, local files)
• 📞 When calling (both through the speaker and through headphones)
• 🎮 In games or videos (especially surround sound) 5.1/7.1)
• 🔔 At notifications (sounds) SMS, push messages, alarm clock)

1. The “Adaptive Sound” function in MIUI is enabled

The most common reason is the built-in MIUI algorithm, which automatically adjusts the volume depending on the surrounding noise, a feature called Adaptive Sound (or Adaptive Sound in the English version) and is activated by default on many Xiaomi devices, which should improve the experience, but often fails, especially on the Redmi Note 8 Pro with unofficial firmware.

To turn it off:

1. Go to Settings. → Sound and vibration.
2. Find Adaptive Sound (which may be called Smart Volume or Adaptive Volume).
3. Move the slider to the off position.
4. Reboot your phone (required!).

If the item is not on the menu, then your version of MIUI does not support it - go to the following ways.

2. firmware bug: known MIUI errors for Redmi Note 8 Pro

The Redmi Note 8 Pro received several major MIUI updates, but some of them contained critical audio-related bugs, such as MIUI 12.0.3.0 and 12.0.6.0, which caused the system to drop volume up to 30% during long-term audio playback, and users complained of problems after upgrading to Android 10 (especially on custom firmware).

Check your version of the software:

1. Open the settings → About the phone → version of MIUI.
2. Compare with the table below – if your version hits a “problem,” upgrade or roll back.

If the update is not available, try resetting the sound settings:

Settings → Applications → Application Management → Three Points (menu) → Resetting App Settings → Select Media and Sound

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Before reset, write down the current settings of the equalizer in a notebook - after the procedure, they will reset.

3. Application conflict: who is "stealing" sound control?

Some programs can intercept volume control, especially if they have access rights to AudioManager.

• 🎧 Headphone apps (such as Sony Headphones Connect or Sony Headphones Connect) JBL App)
• 🎵 Music players with their own sound settings (Poweramp, Neutron)
• 🎮 Game launchers (Xiaomi Game Turbo, NVIDIA GeForce NOW)
• 🤖 Cleaners and Optimizers (Clean Master, DU Speed Booster)

How to find the culprit:

1. Run Settings → Applications → Permissions → Other permissions → Change system settings.
2. See which programs have access to the sound settings.
3. Turn off the permissions for suspicious apps and check if the problem is recurring.

Remove newly installed programs |

Turn off auto-start for music players |

Check the game mode settings |

Clear the cache of applications with access to sound-->

Hardware problems: speakers, connectors and sensors

If software methods didn't work, the cause could be a physical malfunction. The Redmi Note 8 Pro is known for several "weak spots":

1. Oxidation of contacts speaker - due to moisture or dust, the resistance changes, and the system "thinks" that the volume should be reduced.
2. Train damage – if the phone fell, the speaker plume could move away from the board.
3. Faulty proximity sensor – it affects the switching between the speaker and the tube during calls.
4. 3.5mm contaminated connector – if you use wired headphones, check the connector for debris.

Do a quick diagnosis:

• 🔊 Blow into the speaker - if the sound is temporarily restored, the dust is to blame.
• 📱 Swing the phone in your hands - if the volume "jumps," the problem is contacts.
• 🔦 Light a flashlight in a 3.5 mm connector - the debris will be visible to the naked eye.

⚠️ Warning: If you connect your headphones to the sound is completely lost or becomes quieter, do not try to clean the connector with a needle - you risk damaging the contacts. Use compressed air or contact the service.

5. Resetting of sound settings and calibration of speakers

Sometimes the system loses its sound calibration after updates or crashes, in which case a complete reset of the sound parameters will help:

Settings → System → Additional → Resetting settings → Resetting sound and vibration settings

If this item is missing, reset through Engineer Mode (engineering menu):

1. Dial in the dialer: ##36446337##.
2. Go to the Hardware Testing → Audio section.
3. Select Speaker Calibration and follow the instructions.

After calibration, check the volume in different scenarios:

• 🎶 Music through the speakers
• 📞 Call on speakerphone
• 🎥 surround-sound video

6. Problems with Bluetooth and wireless headphones

If the sound is reduced only when connected via Bluetooth, it may be the fault:

• 🔄 Incompatibility of codecs (e.g., aptX or LDAC Not supported by your headphones).
• 📶 Interference from other devices (Wi-Fi router, microwave, other Bluetooth gadgets).
• 🔋 Low headphone charge – some models automatically turn down the volume when the discharge is below 20%.

Decisions:

1. In Bluetooth settings, select Sound Quality → Stability Priority (instead of Quality).
2. Turn off other Bluetooth devices within a 5-meter radius.
3. Update the headphone firmware (if supported).

⚠️ Attention: There's a Bluetooth 5.0 bug on the Redmi Note 8 Pro that causes volume to drop to a minimum when connected to some car radios. MIUI 11 or use AUX-cable.

7.Extreme measures: factory reset and flashing

If nothing has worked, radical methods remain:

1. Reset to factory settings (delete all data!): Settings → About phone → Reset settings → Delete all data Before doing this, make a backup!
2. Fastboot Flashback (for power users): Download the official firmware from Xiaomi's website. Use the Mi Flash Tool to install.

After flashing:

• ✅ Do not restore settings from backup – this can return the bug.
• ✅ Install only the required applications (one by one, checking the sound).
• ✅ Turn off automobility updates MIUI 1-2 weeks to check for stability.

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If the problem appeared after a phone drop or moisture hit, resetting settings and flashing will not help - diagnostics are required in the service center.

FAQ: Frequent Sound Questions on Redmi Note 8 Pro