Customization of sound effects on Xiaomi Redmi Note 9 Pro: from equalizer to Dolby Atmos

Why does the sound on the Redmi Note 9 Pro require fine tuning?

Xiaomi Redmi Note 9 Pro is equipped with stereo speakers and support for Dolby Atmos, but by default the sound often sounds muffled or imbalanced. It is not only hardware limitations, but also factory settings MIUI, optimized for the "average" user, for example, bass can "dum" in cheap headphones, and voices in movies - lost in the background of music.

Fortunately, there are a number of audio customization tools hidden in the firmware, from standard MIUI Equalizer to Hi-Fi and Dolby Atmos modes. The problem is that these features are scattered across different menus, and some require activation through an engineering menu at all. This article provides a complete guide to all the ways to improve sound on the Redmi Note 9 Pro, including hidden settings and bypassing the limitations of MIUI.

It's important to understand that no software tweaks will turn a budget smartphone into an audiophile player, but the right settings will help:

• 🔊 Increase the volume of the speakers without distortion
• 🎧 Optimize the sound for specific headphones (from AirDots to Sony) WH-1000XM4)
• 🎬 Improve the sound in games and movies with Dolby Atmos
• 🎵 Set up an equalizer for genres of music (from classics to metal)

The basic sound settings are available via MIUI Equalizer

The easiest way to change the sound is to use Xiaomi’s built-in 5-band equalizer, which works for both speakers and headphones, but has a limitation: settings are reset when new devices are connected.

To open the equaliser:

1. Go to Settings → Sound and vibration → Equalizer
2. Select a profile (such as “Bases” or “Voice”) or click Customize
3. Adjust sliders for frequencies: 60 Hz (bass), 230 Hz (lower middle), 910 Hz (medium frequencies), 3.6 kHz (upper middle), 14 kHz (upper frequencies)

Advice for setting up:

• 🎸 For rock music: raise 230 Hz and 3.6 kHz, slightly reduce 60 Hz so that the basses don't "dirty" the sound
• 🎤 For podcasts: boost 910Hz and 3.6kHz for better legibility of voice
• 🎧 For headphones with weak bass: Lift 60Hz as much as possible, but be prepared for possible distortions at high volume

Save profile as "My Style" | Checked sound on different tracks | Make sure settings apply to speakers and headphones | Turn off "Adaptive Sound" in Dolby settings (if enabled)

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⚠️ Warning: If the sound becomes hoarse after changing the equalizer, reset the settings to factory and reduce the volume by 20%. MIUI Automatically restricts power at high frequencies to protect speakers.

Dolby Atmos Activation: How to Enable and Configure

The Redmi Note 9 Pro supports Dolby Atmos, but this feature is often hidden or disabled by default.Dolby improves spatial sound, especially noticeable in movies and games, but can make music unnecessarily "processed."

To turn on Dolby Atmos:

1. Open the Settings → Sound and vibration → Dolby Atmos
2. Select mode: Auto - adapts to content (recommended for beginners) Movie - reinforced environment for cinema Music - extended dynamic range Game - focus on sound effects (steps, shots)

Dolby Atmos for speakers

Dolby Atmos for headphones

For fine tuning:

• 🎛️ In the section Additional, turn off Adaptive Sound if you want manual control.
• 🔄 In Movie, try to turn on the Dialogue amplifier - this will help you better hear the lines in loud scenes
• 🎧 For noise-producing headphones (such as Xiaomi AirDots Pro), select Music Mode and turn off Virtual Volume to avoid echoes.

Automobile|Film|Music.|Game.|I don't use Dolby.-->

Hidden audio settings: engineering menu and MTK Audio Tuner

For advanced users, the Redmi Note 9 Pro offers hidden audio customization tools via the Engineering Menu and MTK Audio Tuner.

• 🔊 Increase the maximum volume of speakers (with the risk of distortion)
• 🎛️ Set up a left/right channel separately
• 🔧 Change the parameters of the digital amplifier (DAC)

To open the engineering menu:

1. Enter the phone combination in the app: ##36446337##
2. Go to the Hardware Testing section → Audio
3. To adjust the volume, select LoudSpeaker Mode or Headset Mode.

In the MTK Audio Tuner section (not available in all versions of MIUI), you can change:

• 🔹 Speaker Gain – Signal amplification for speakers (values above 6 can damage equipment!)
• 🔹 Headphone Impedance – headphone resistance (install 32 ohms for most models)
• 🔹 DAC Filter - type of filter digital-to-analog converter (optimally: Sharp Roll-Off)

⚠️ Warning: Changing the settings in the engineering menu can cause hardware damage to speakers or headphones.Do not zoom in on Gain above +3 dB without testing at low volume. If the sound is gone after the changes, reset the settings via Settings → System system → Resetting settings → Reset the sound settings.

Customizing sound for specific applications

MIUI allows you to assign separate audio profiles to different applications, for example, you can turn on Dolby Atmos only for Netflix, and for Spotify you can leave pure sound without processing.

How to set up:

1. Open Settings → Applications → Permissions Management → Autorun
2. Select an app (like YouTube) and click Sound
3. Set Priority: Media for Music and Video Notifications for Messenger Calls for VoIP (WhatsApp, Telegram)

Separate sound settings

Examples of optimal settings:

• 🎵 Spotify/Apple Music: Disable Dolby, use custom equalizer with lifting on 60 Hz and 3.6 keto
• 🎬 Netflix/YouTube: Turn Dolby on in Movie Mode + Dialogue amplifier
• 🎮 PUBG/Free Fire: Dolby in Game Mode + Turn off music and media in the game's sound settings

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If the game sound is too quiet and there is no volume control in the settings, try turning on Game Mode in the notification curtain. MIUI automatically redirects sound resources to the application in the foreground.

Improved sound in headphones: setting impedance and codecs

The Redmi Note 9 Pro supports SBC, AAC, aptX and LDAC codecs, but by default uses SBC, the simplest and most versatile. For headphones with support for aptX or LDAC (for example, Sony WH-1000XM4), you can manually select the codec for the best quality.

How to change the codec:

1. Connect your headphones to Bluetooth
2. Open Settings → Connected devices → Settings gear next to headphones
3. Select the Audio Codec and prioritize: LDAC is the best quality (990 kbps), but more aptX Adaptive latency – the balance of quality and AAC latency – is optimal for iPhone headphones (AirPods).

For wired headphones, it’s important to adjust impedance (resistance). By default, MIUI is optimized for 32 Ohm impedance headphones, but if you use 16 Ohm models (like the Xiaomi Piston) or 250 Ohms (like the Beyerdynamic DT 770 Pro), the sound can be too quiet or distorted.

To change the impedance:

1. Enable the Engineering Menu (see section above)
2. Go to Hardware Testing → Audio → Headset Mode
3. Find the Headphone Impedance option and set a value close to the characteristics of your headphones.

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The LDAC codec provides the highest sound quality, but consumes 15-20% more battery and can cause stuttering when a weak Bluetooth signal is present.

Solving Common Sound Problems

Even after adjusting the sound effects, Redmi Note 9 Pro users face typical problems.

If the sound is completely gone,

1. Check if Do Not Disturb or In Your Pocket (swipe down → bell icon) is activated
2. Reboot your phone – sometimes the sound driver “hangs” after connecting the headphones
3. Open Settings → Applications → Application Management → Media and Reset the Settings for Media Storage App

⚠️ Note: If after the update MIUI Dolby Atmos Settings are missing, reset via Settings → Memory. → Clear the data for Dolby, which will return factory profiles, but will remove your custom settings.

FAQ: Frequent questions about sound tuning