Xiaomi Redmi 7A is a budget smartphone with good specs, but many users face the problem of low sensitivity of the microphone. Poor hearing during calls, noise when recording voice or quiet sound in messengers — these symptoms are familiar to owners of the model, the causes can be hidden in both software settings and hardware malfunctions.
In this article, we’ll look at 7 proven ways to increase microphone sensitivity on Redmi 7A, from basic Android settings to fine-tuning through an engineering menu. You’ll learn how to check microphone performance, which apps will help amplify sound, and when to contact a service center. All methods are tested on current versions of MIUI and do not require root rights (except for one exception).
1. Microphone check: diagnosing the problem
Before you set up the microphone, make sure that the problem is not mechanical damage or contamination. The Redmi 7A has two microphones: the main one (below next to the charging connector) and the secondary one (top one, for noise reduction).
How to test the microphone without third-party applications:
- 📱 Open the Dictaphone application (included in the standard set) MIUI) And record 10 to 15 seconds of speech 20 to 30 cm from the phone, and play it back: if you can barely hear it or wheez, the problem is confirmed.
- 📞 Call another phone and ask the person to rate the sound quality, and if they complain about a quiet voice or noise, the microphone is not working properly.
- 🎤 Use Google voice search: say, "OK, Google," and ask a question. If the system doesn't recognize speech the first time, the microphone's sensitivity is not sufficient.
If the microphone doesn’t work at all (there is no sound on the recording), the reasons may be more serious:
- 🔌 Pollution of the microphone hole (dust, pile, moisture).
- 🔧 Damage to the plume after falling or disassembling the phone.
- 🛠️ Software failure after update MIUI.
2. Basic settings of Android and MIUI
Often, the problem is solved by adjusting standard system settings. On the Redmi 7A, access to microphone settings is limited, but a few key options are worth checking.
Open Settings → Sound and vibration and pay attention to:
- 🔊 Volume level of microphone: in MIUI There is no direct controller, but you can activate the voice enhancement option (available in some firmware versions).
- 🎧 Bluetooth Settings: If the problem only occurs when you connect the headset, turn off the option Absolute Volume.
- 📱 Do Not Disturb Mode: Make sure it doesn’t block apps from accessing the microphone.
For apps (WhatsApp, Telegram, Viber) check the permissions:
- Go to Settings → Applications → Application Management.
- Select the messenger, then the permissions → the microphone.
- Make sure access is allowed (not "Request every time").
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If the microphone started to work worse after the MIUI update, try resetting the sound settings: Settings → System and device → Resetting the settings → Reset the sound settings.
3. Engineering menu: hidden microphone settings
The Xiaomi Redmi 7A has an engineering menu where you can manually adjust the microphone settings. Careful: incorrect changes can worsen the sound quality or lead to crashes!
How to open the engineering menu:
- Open the Phone app.
- Enter the code ##36446337##
- Select the Hardware Testing → Audio tab.
In the Audio section, find:
- 🔧 Mic - microphone test (check signal levels for Mic 1 and Mic 2).
- 📊 Volume, you can increase the Mic Gain value, and the standard value is 0 or 1, try to increase it to 3-5.
- 🔇 Noise Suppression – Turn off this option if the microphone is too vocally suppressing.
What to do if the engineering menu is not opened?
After the changes, restart your phone and check the microphone, and if the sound quality has deteriorated, return the original parameters.
4. Microphone amplification applications
If standard settings don't work, use third-party utilities that work on top of the system and can greatly improve microphone sensitivity. Importantly, some applications require root rights to work properly.
Top.-3 supplant 7A:
| Annex | Functions | Root | Reference |
|---|---|---|---|
| Microphone Amplifier | Increases microphone volume to 200 percent, noise filter | ❌ No. | Google Play |
| SoundAbout | Redirection of audio streams, strengthening the microphone | ⚠️ Partially. | Google Play |
| ViPER4Android | Advanced sound processing, equalizer for microphone | ✅ Yes. | XDA Developers |
Instructions for Microphone Amplifier:
- Install the app and give access to the microphone.
- Enable the Amplify Microphone option.
- Set up the gain level (start with 1.5x, don’t exceed 2.5x, and noise will appear).
- Activate the Noise Reduction filter.
Install Magisk (for root)
Download the latest version of ViPER4Android
Install drivers through Magisk Module
Restart the phone after installation
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⚠️ Attention: Apps with microphone amplification can increase noise levels. If after setting up, people complain of echoes or distortions, reduce the gain or turn off filters.
5. Cleaning the microphone hole
One of the most common reasons for the poor sensitivity of the microphone on the Redmi 7A is clogging holes, dust, pile from a pocket or moisture can block the sound signal, cleaning takes 5 minutes and does not require disassembling the phone.
What you need:
- 🕯️ Toothpicking (plastic or wooden).
- 💨 Compressed air container (optional).
- 🔦 Lighting lamp for openings.
Step-by-step:
- Turn off the phone.
- Find microphone holes: Main microphone: bottom, next to the Micro-USB connector. Additional microphone: top, next to the headphone jack.
Carefully remove the dirt with a toothpick (do not press hard!).
Blow the holes with compressed air (hold the balloon vertically, the distance is 5-10 cm).
Turn on your phone and check the microphone.
⚠️ Warning: Do not use metal objects (needles, pins) - they can damage the protective mesh of the microphone.If after cleaning the quality has not improved, the problem may be in the plume or microphone module itself.
Hardware malfunctions and repairs
If the software methods didn't work, the reason is the hardware. 7A most often:
- 🔌 Microphone module (wear or factory defect).
- 📶 Connection plume (breakdown after fall).
- 💧 Oxidation of contacts (infection of moisture).
How to diagnose a hardware breakdown:
- 🔍 Check the microphone on another phone (plug in an external microphone via a phone) OTG-If the sound is normal, the problem is Redmi. 7A.
- 🛠️ Disassemble the phone (only if you have experience!) and inspect the plume for damage.
- 💰 Replace the microphone with Redmi. 7A worth ~500-800 rubles (depending on the region).
The cost of repairs in 2026:
| Service | Price (₽) | Time (hours) |
|---|---|---|
| Microphone diagnostics | 300–500 | 0.5–1 |
| Replacement of the main microphone | 600–900 | 1–2 |
| Replacement of the plume | 1200–1800 | 2–3 |
| Cleaning for oxidation | 400–700 | 1–1.5 |
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If the phone fell or came into contact with water, don’t try to repair the microphone yourself – without special equipment, you risk damaging the board.
Alternative solutions
If the repair or adjustment has not worked, consider alternative options:
Outside microphone:
- 🎤 Connect. USB-microphone OTG-adapter (e.g. Fifine) K669B).
- 🎧 Use a headset with a microphone (wired or Bluetooth).
Programmatic workarounds:
- 📱 Record your voice through another device (e.g., headphones with a microphone).
- 🔄 Use applications to transmit sound over Wi-Fi (for example, WO Mic).
Replacement of telephone:
If the Redmi 7A is used as a working tool (for calls or streams, for example) and the microphone is not repairable, consider the models with the best audio performance:
- Xiaomi Redmi Note 12 Pro+ (4 microphones, noise reduction).
- POCO X5 Pro (enhanced audio chip)