How to increase the volume of recording from the recorder on the Xiaomi Redmi phone

Modern Xiaomi Redmi smartphones are equipped with high-quality microphones, but in noisy environments or when away from the sound source, the standard recording can be too quiet. This is a common problem faced by students, journalists and ordinary users trying to record a lecture or an important interview. Built-in noise reduction algorithms often “smother” a useful signal, making playback almost impossible without additional amplification.

There are several proven ways to do this, from basic system settings to specialized software. Hardware constraints are not going anywhere, but software processing can do wonders by squeezing the most out of the hardware. It's important to understand that over-amplification can lead to hissing and distortion, so balance is needed.

In this article, we will discuss how to set up your gadget to get the loudest and cleanest sound possible. We will look at both the standard MIUI and HyperOS shell tools, and the capabilities of third-party applications that often exceed standard functionality. Digital signal processing allows you to compensate for the shortcomings of the microphone, if you know which sliders to move.

Basic verification of multimedia settings and system

Before you go to complex manipulations, you should make sure that all the basic volume levels are twisted to the maximum. In the Android operating system, the sound levels are divided into categories: call, alarm, multimedia and system sounds. For a voice recorder, the critical level is the media level, which is often not installed at full power by default to protect the user's hearing.

Press the volume buttons on the side of the body. When a slider appears on the screen, press the gear or three dots to expand the menu. Make sure the note slider (music) is in the far right position. It's also worth checking if the Silence or Do Not Disturb mode is activated, which can programmatically limit the output of sound.

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Use physical volume buttons during the recording process itself – this sometimes allows you to dynamically change the microphone sensitivity in real time, if such an option is supported by the driver.

You also have to look at the sound effects settings. In the Settings menu → Sound and vibration → Sound effects are often hidden important parameters. Here you can find an equalizer that affects the frequency range of the recorded and reproduced sound. Properly tuning high frequencies can make speech more legible, which is subjectively perceived as increasing volume.

Use of built-in MIUI sound enhancement features

The MIUI shell and Xiaomi’s new HyperOS have their own audio processing algorithms that are enabled by default, but they can be fine-tuned. The Mi Recorder app often has a gear or three dots setting button in the corner of the screen, and that’s where the keys to success lie.

Find a quality setting. You'll usually have a choice between Standard, High, and No Compression. The No Compression or Maximum Bitrate mode saves more sound detail, which gives you more room for later amplification when you play it. Compressed formats like low MP3 bitrate lose momentum irrevocably.

Also, pay attention to the recording modes. If you're in a quiet room, choose General or Studio. If you're recording outside or in a noisy place, Interview or Noise Control can, on the contrary, lower the overall volume by cutting off background noises along with a quiet voice. Experiment with these modes, because they affect the sense-itality of the microphone in different ways.

Use of third-party applications to enhance recording

Staffing doesn't always meet the needs of professionals or users with specific needs, and in this case, Google Play Store apps that have more flexible Gain settings come to the rescue, and one of the best solutions is Easy Voice Recorder or RecForge II.

These programs allow you to manually adjust the microphone gain before recording, so you can set (Gain) to +10dB or even +20dB, which will make the recording much louder immediately during the sound capture stage, which is preferable to amplifying a quiet file later, since when writing with a high signal level, the best signal / noise ratio is maintained.

• 📱 RecForge II: Allows you to select a specific sound source and adjust the microphone amplification in decibels.
• 🎚️ Smart Recorder: Auto-gain control, which dynamically increases the volume of quiet areas.
• 🎙️ Dolby On: An app from a renowned audio technology company that automatically processes recording by adding volume and removing noise.

When using third-party software, it is important to give the necessary permissions. Android, especially on Xiaomi, aggressively manages permissions. When you first start, be sure to allow access to the microphone and, if the application requests, access to background work so that the recording does not interrupt when the screen is turned off.

Set up Dolby Atmos equalizer and sound effects

Many mid- and flagship-level Xiaomi Redmi models feature Dolby Atmos technology, and while this technology is primarily designed to play back, it can affect how you hear a recording you just made, and in some scenarios, how you process the incoming audio stream.

Go to Settings → Sound and Vibration → Sound Effects. Turn on Dolby Atmos and select the profile "Advanced" or "Dynamic." In manual equalizer mode, try lifting sliders in the medium frequency range (about 1 kHz - 3 kHz), where the bulk of human speech lies, which will make the voice clearer and louder to hear.

It is worth noting that the equalizer settings apply globally to the system, which means that after listening to the enhanced recording, the music in the player will also sound changed, so after you finish working with the recorder, it is recommended that you return the equalizer settings to the "Normal" or "Reset" position.

Engineering menu and deep calibration of the microphone

For advanced users, there is an engineering menu where you can change the sensitivity of the microphone at the driver level, a method that requires caution, since incorrect settings can lead to the microphone flashing or malfunctioning in calls, accessed through a set of special code in the "bell ringer".

Dial ##6484## or ##3646633## (code may vary depending on the MediaTek or Snapdragon processor and MIUI version). From the Hardware Testing menu, go to Audio → Audio Debugging. You can find settings for different use cases, such as Normal Mode or Headset Mode.

⚠️ Warning: Changing the parameters in the engineering menu (especially Gain and Limiter values) can lead to irreversible changes in the operation of the audio subsystem.

Inside the menu, find the Record setting, which can make the recording louder by increasing the Digital Gain, but be prepared for the background noise to increase with the voice, and the "clicking" effect to occur, which is a method for those who understand what they're doing.

Post-processing of recorded files

If you've already recorded a record and it's too quiet, you can make it programmatically amplified, and that often gives you a better result than trying to tune the microphone, because you can see the result and you can control the level of distortion, and you can use audio editors on the phone, like the Lexis Audio Editor or WaveEditor.

Open the file in the editor and find the Amplify effect or Normalize effect. Normalization will automatically raise the volume level to the highest possible level without distortion (usually to -1dB or 0dB).

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Normalizing sound is the best way to increase the volume of a finished file, as it evenly raises the signal level without creating sharp peaks of distortion.

Compression is also available in editors, and compressors compress dynamic ranges, where quiet sounds get louder and loud noises don't overload, and this makes the recordings denser and louder in general, which is especially true for lectures where the speaker is quiet and moving away from the microphone.

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