How to increase volume on Xiaomi Redmi Note 9: from basic settings to hidden chips MIUI

Xiaomi Redmi Note 9 is one of the most popular smartphones in the budget segment, but many users are faced with the problem of insufficient volume of speakers or headphones. Even at maximum settings, the sound can seem quiet, especially in noisy conditions or when listening to music through external speakers. In this article, we will discuss all possible ways to increase the volume, from standard MIUI parameters to hidden functions and third-party applications.

It's important to understand that volume limits are often put at the firmware level to protect speakers from overload. However, with the right settings and tools, you can safely boost the sound without risking damage to the machine. We'll also look at how to avoid distortion and preserve audio quality, because simply increasing the volume doesn't always guarantee a good result.

1. Basic volume settings in MIUI

Before you resort to complex manipulations, check the standard sound parameters.The Redmi Note 9 has several volume controls that many users confuse or overlook.

Open the Quick Settings panel with your finger down the screen, and here you'll see a volume slider, but it only controls media sound (music, video, games) and separate settings for calls and alarms, to access all the regulators:

1. Click on the gear next to the volume slider in the notification panel.
2. In the menu that opens, select Sound and Vibration.
3. Here you will see individual sliders for: 🔔 Call – the volume of incoming calls. 🎵 Media - music, video, games. ⏰ Alarm clock - the sound of the signal. 📞 Notifications - Alerts from Applications.

Make sure all sliders are set to maximum. Also note the option to turn up the volume in the headphones – it appears when wired or Bluetooth headphones are connected and can add +10-15% to the sound.

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If the headphones are quieter after you plug them in, check them on another device, and maybe the problem is with the headphones themselves, not the smartphone.

Activation of the "Sound Amplifier" mode in MIUI

MIUI has a hidden Sound Amplifier feature that increases volume through software processing, and is especially useful for users with hearing impairments or when listening to music in noisy places.

To turn it on:

1. Go to Settings. → Special facilities.
2. Select the Sound Amplifier (in some versions of MIUI, this item may be called Audio Amplifier).
3. Activate the slider and adjust the gain level. The optimal value is 1.5x-2x, as higher settings can lead to distortion.

This feature works for both built-in speakers and connected headphones, but note that at maximum amplification (3x-4x), the sound can become hoarse, especially at low frequencies.

3. Equalizer and sound effects setup

The correct equalizer settings can visually increase the volume by raising certain frequencies. The Redmi Note 9 has a built-in equalizer, but it is hidden in the settings of the Mi Music player.

How to set up:

1. Open the Mi Music app (or any other equalizer, such as Spotify).
2. During the playback of the track, click on the icon 🎛️ (equalizer) in upper right corner.
3. Choose Rock or Pop presets – they raise the medium and high frequencies, which subjectively makes the sound louder.
4. To manually adjust, lift the sliders 1-3 kHz and 8-10 kHz by +3-5 dB.

Before installing, check for compatibility reviews with your version of MIUI. Some applications may conflict with system sound drivers.

Important: Boost apps can increase the load on the processor, which will lead to faster battery discharge (up to 10-15% per hour of active use).

5. Modification of system files (for advanced users)

If you're willing to take risks, you can change the system files that control volume, which requires an unlocked bootloader and root rights, and can also lead to loss of warranty.

Instructions for experienced users:

1. Install Magisk and get root rights.
2. Download a file manager with root support (such as Root Explorer).
3. Cross the path. /system/vendor/etc/ and find the file. mixer_paths.xml.
4. Make a backup copy of the file, then open it in the text editor.
5. Find the RX1 Digital Volume and RX2 Digital Volume lines, change the values from 84 to 92-95 (maximum 100, but it's dangerous for speakers!).
6. Save the file, restart the device.

This method gives the most significant increase in volume (up to +30-40%), but is fraught with consequences:

• ⚠️ Risk of damage to speakers during prolonged use.
• ⚠️ Possible distortion of sound at high frequencies.
• ⚠️ After updating MIUI change.

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Changing system files without a backup can lead to a device blink (completely inoperable).Always save the original files and have firmware on hand to restore.

6. Checking hardware problems

If none of the software methods worked, it may be the hardware that's the problem. Typical Redmi Note 9 malfunctions affecting volume:

For diagnosis:

1. Connect headphones – if the sound in them is normal, the problem is in the dynamics of the smartphone.
2. Try to play the sound through a Bluetooth speaker.
3. Record the video from the microphone of another phone, so you can hear the real volume.

If you suspect a hardware malfunction, you should contact a service center. Self-repair without experience can aggravate the problem.

7. Alternative ways to amplify sound

Sometimes you can turn up the volume without changing the settings of the phone.

• 🔋 Use an external amplifier. Low-cost Bluetooth amplifiers (e.g. FiiO) BTR3K) add +20–30% volume without loss of quality.
• 🎤 In the Redmi Note 9, the bottom speaker is often overlaid with your hand - try holding the phone at a different angle.
• 📦 Use a resonator. Put your phone in an empty cup or box, and that will amplify the low frequencies through acoustic resonance.
• 🔄 Update the firmware. MIUI Sometimes they optimize sound drivers. Check for updates in Settings → The phone. → Updating the system.

Also worth paying attention to the audio file format. Music in FLAC or WAV will sound quieter than in MP3 320 kbps, due to the lack of compression. For maximum volume, use files with a bitrate of 256-320 kbps.

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If you're listening to music through YouTube, turn on the "Always Play High Quality" option in the app settings (Settings → Playback Quality) to reduce audio compression.

FAQ: Frequent Volume Up Questions on Redmi Note 9