Sound problems during calls to Xiaomi Redmi 9A — One of the most common user complaints is that you call a friend or colleague, but the voice of the person you're talking to is lost, sounds like a barrel, turns into an indistinct hiss, and it gets worse if the malfunction is not permanent. Now, today, everything works, and tomorrow you have to call back or switch to speakerphone again, and what is the reason for this behavior of a budget smartphone, and can you solve the problem yourself without going to the service center?
In this article, we will discuss 7 main reasons why Redmi is a great resource. 9A It's a very poor voice response, from the simple clogging of the speaker to software failures in the firmware, and you'll learn how to do diagnostics at home, what settings to check first, and when to actually carry your phone for repair. We also have a 5-step checklist that will help you quickly identify the source of the problem.
It is worth noting that Redmi 9A — It's a budget device with a simplified hardware, and some of the problems with sound may be due to savings on components, but 80 percent of the time, it's not hardware, but software tweaks or mechanical damage that can be easily repaired without special skills.
If you've tried to reboot your phone, clean your speaker, or reset your settings, but nothing has worked, don't be too upset. There's a section in the article that has some non-obvious solutions that are rarely mentioned in standard instructions. For example, why the problem may arise due to the incorrect operation of the module NFC (Yeah, he's even in Redmi. 9A!) How does regional firmware affect sound.
1. Clogging or damage to the speaker
The most obvious and common cause of poor hearing is a physical clogging of the speaker. 9A The speaker is located at the top of the phone (near the front camera) and is protected only by a small grid, which eventually gets dust, villi from your pocket, cosmetics particles or even sweat if you often talk with your phone against your ear.
How to check:
- Light a flashlight on the speaker - if you see a buildup of dirt, the problem is obvious.
- Call your phone and put it to your ear: If the sound gets better when you change the angle of inclination, it’s likely that the speaker is jammed.
- Try playing any audio file through a speaker (for example, in the Dictator app) and if the sound is distorted or missing, the speaker is faulty.
What to do:
- 🧹 Soft brush cleaning: use a soft bristling toothbrush or makeup brush. Walk gently across the speaker grid without pressing hard.
- 💨 Compressed air purge: a spray of compressed air (to clean the machinery) will help blow out the dust. Keep the balloon upright so as not to freeze the components.
- 🔧 Disassembling the phone: if the dirt is deep inside, you have to remove the top panel. It's risky without experience.
⚠️ Warning: Do not use sharp objects (dental cleaners, needles) to clean the speaker! this can damage the membrane or contacts, and then a complete replacement of the module will be required.
If the sound hasn't improved after cleaning, maybe the speaker has been mechanically damaged (like after the phone fell) or has failed due to moisture, in which case only a replacement will help. 9A — from 300 to 600 rubles, and the work on replacement will cost another 500-1000 rubles.
2. problems with the microphone of the interlocutor (not your phone)
Before digging into your Redmi settings 9A, Make sure that the problem is not on the other side, because the bad hearing can be caused by a faulty microphone in the other person's phone, in which case you will hear their voice quietly, with interference or intermittently, regardless of the model of your device.
How to check:
- Call the same person from another phone, and if the problem repeats, it's their microphone.
- Ask the person to switch to speakerphone or use a headset, and if the sound improves, it's their main microphone.
- Write down a voice message in a messenger (for example, WhatsApp or Telegram), if the interlocutor sounds bad and in the recording, the problem is exactly on his side.
Typical reasons on the part of the interlocutor:
- 🎤 Clogging or damaging the microphone (similar to the speaker in your phone).
- 📶 Poor quality of communication due to weak network signal (especially in the subway or on the outskirts of the city).
- 🔇 Using a cheap headset with a bad microphone.
- 📱 Software failures in his phone (for example, Quiet Call mode is enabled or noise cancellation function is activated).
If the problem is really on the side of the interlocutor, you can advise him:
- Clean the microphone (usually located at the bottom of the phone).
- Disable the noise reduction function in call settings.
- Try calling via the Internet (VoIP) – for example, in Viber or Zoom, where the sound quality is often better than on a mobile network.
3. Incorrect sound and call settings
Sometimes, poor hearing is not due to hardware problems, but to incorrect phone settings. 9A There are a few things that can affect the sound quality of calls.
The main settings that need to be checked:
- Speaker Volume: Press the up/down volume buttons during the call. Make sure the slider is not kept to a minimum.
- Voice Improvement Mode: Go to Settings → Sound and vibration → Improve your voice and turn it off. Sometimes it distorts the sound instead of improving it.
- Network settings: C Settings → SIM-maps and mobile networks → [yours SIM] → Type of network Select Only 4G (preferably. 2G/3G Quality of communication is often worse.
- Disable VoLTE: if you have VoLTE enabled (voice via voice) 4G), Try to turn it off. Sometimes operators don't optimize the technology well. → SIM-maps and mobile networks → [yours SIM] → VoLTE Challenges.
It is also worth checking whether special modes are activated accidentally:
- 🔇 Do Not Disturb: It can block some audible notifications, including calls.Way: Settings → Sound and vibration → Don't disturb.
- 🎧 Default speaker mode: If it's on, the sound can automatically switch to an external speaker. → Special facilities → Rumor → High-profile communication.
- 📡 Traffic Saving Mode: Limits the quality of communication to save data. → SIM-maps and mobile networks → Saving traffic.
☑️ Checking the sound settings in Redmi 9A
If the sound is better after the settings change, but the problem returns after the phone restarts, it may be the fault of the system, in which case resetting the settings to the factory will help (more about this in section 6).
4. Software failures and firmware errors
Xiaomi Redmi 9A It's firmware-based. MIUI, And this is something that, despite regular updates, sometimes contains bugs that affect the sound quality, and this is especially true for users who are not able to use it:
- Install custom firmware (unofficial assembly).
- Updated to the new version MIUI, but didn't reset the settings.
- Use regional firmware not intended for their model (for example, European firmware on the phone for the Chinese market).
Typical signs of software failure:
- The problem occurs after the system update.
- The sound is lost or distorted only in certain applications (for example, on WhatsApp, but not in a standard call).
- After restarting the phone, the sound is temporarily restored.
How to fix software errors:
- Cleaning the system cache: Go to Settings → The phone. → Click on "Clear cache" (confirmation may be required).
- Resetting the settings of the Phone application: Open Settings → Annexes → App management. Find the phone app, click on it. Select Storage" → "Clear the data" and "Clear the cache".
- Retracement to the previous version MIUI (if the problem has appeared after the update: Download the old firmware version from the official Xiaomi website ("Download" section). → The phone. → Update system. Click on three dots in the top right corner. → "Select a firmware file" and specify the downloaded file.
If you use custom firmware, go back to the official firmware. MIUI. Unofficial builds are often poorly optimized and can cause conflicts with audio drivers.
⚠️ WARNING: Before resetting or flashing backup data! at Redmi 9A For this, go to Settings. → Additionally. → Backup and reset → Local backup.
Critical information: In firmware MIUI for Redmi 9A Up to version 12.0.8, there was an error that caused the sound to disappear when activated. NFC. If you use contactless payments, try turning off NFC in settings (Settings) → Connection and sharing → NFC) Check to see if the sound improves.
5. Problems with SIM-card-carrier
The sound quality of the calls depends on the stability of the connection with the operator. If the signal is weak or unstable, the voice of the interlocutor may be interrupted, sound robotic or disappear. 9A This is especially noticeable due to the budget communication module, which is worse at dealing with interference.
How to check the quality of communication:
- Look at the network indicator in the top bar. If it's 1-2 divisions or an H icon.+ (3G) instead 4G, weak-signal.
- Call from the same location on another phone, and if the problem recurs, it's the operator's fault.
- Check if the Traffic Saving mode is activated (we talked about it in Section 3).
What to do if the problem is with the operator:
| Problem. | Decision | Note |
|---|---|---|
| Weak signal in the room. | Use Wi-Fi Calling (Internet Calling) | Included in Settings → SIM-maps and mobile networks → [yours SIM] → Wi-Fi Calling |
| Frequent communication breakdowns | Switch to another operator or tariff with priority 4G | Tele2 and Iota often have better coverage in the regions than the Big Three. |
| Net noise and interference | Turn on VoLTE (if disabled) | VoLTE provides clearer voice transmission, but requires good voice transmission. 4G-covering |
| Problems with a specific number only | Try calling via messenger (WhatsApp, Viber) | Sometimes operators block or restrict traffic for certain destinations. |
If you often call from areas with poor coverage (basement, elevator, suburban area), consider buying a repeater signal (network amplifier), which costs from 2000 rubles, and they significantly improve the quality of communication.
💡
Before traveling to a region with poor coverage, download offline maps in Google Maps or Yandex.Navigator – this will help save traffic for calls.
6. Hardware malfunctions: What breaks down at Redmi 9A
If all software methods have been tried but the sound is still bad, chances are the problem is in the phone's hardware. 9A The following components are most often broken down:
Typical hardware faults:
- 🔊 Damage to the Speaker: The Membrane May Break from Time or Mechanical Exposure.
- 📶 Antenna module malfunction: Receives network signal, and if it's damaged, the sound will be interrupted.
- 🔌 Oxidation of contacts on the motherboard: due to moisture or temperature changes.
- 🔋 Mik/dynamic power problems: often associated with a faulty plume.
- 📱 Cracks on the motherboard: can appear after the fall of the phone.
How to diagnose a hardware malfunction:
- Check if the speaker is working in other modes (e.g. playing music or an alarm clock) if not, it's broken.
- See if there was any physical damage on the phone (falling, getting wet, overheating).
- Connect the headset: if the sound in the headphones is clear, the problem is in the speaker or plume.
- Try inserting another one. SIM-If it's working properly, the problem is yours. SIM or her slot.
Cost of repair in the service center:
- Replacement of a conversational speaker: 500-1000 rubles.
- Replacement of the antenna module: 1000-1500 rubles.
- Repair of the motherboard (contact soldering): 1500-3000 rubles.
- Replacement of the plume: 800-1200 rubles.
⚠️ Warning: If the phone falls into water or is exposed to extreme humidity, do not turn it on and try to dry with a hair dryer! Contact oxidation may worsen.
If you have a Redmi. 9A If you have any warranty, don’t try to repair it yourself, it will void warranty obligations. Contact the official Xiaomi service center (the list can be found on the website mi.com).
Non-obvious causes: from NFC before regional settings
Sometimes bad hearing in Redmi 9A It's associated with unexpected factors that users don't even know about:
List of non-obvious reasons:
- 📱 Conflict with NFC: As mentioned earlier, some of the activation NFC It can affect the sound. Try turning it off in Settings. → Connection and sharing → NFC.
- 🌍 Regional settings: If the phone is purchased for another market (e.g. Chinese), there may be issues with network frequency compatibility. → Additionally. → Region.
- 🔋 Battery savings: In super-saving mode, the system may limit the performance of the communication module. → Battery and productivity → Savings regime.
- 🎵 Application conflict: Some programs (such as screen call records or modified messenger clients) may block the microphone. → Annexes → Permits → Microphone.
- 🔄 Failure to work IMEI: if IMEI If your phone is dropped or damaged, you may have communication problems#.
One of the strangest cases that Redmi users have encountered 9A — This is the effect of the cover on sound quality, because some cases (especially metallized or magnetized) can shield the antenna signal or block the microphone.
Another rare but possible cause is the problem with SIM-Over time, contacts. SIM-The cards become oxidized or worn out, which causes the network to be unstable:
- Gently wipe your contacts. SIM-cards with a stripe (for cleaning from oxidation).
- Insert SIM-card in another slot (if the phone supports two) SIM).
- Replace SIM-New card (especially if you are older than 5 years old).