Finding the voice element in a modern smartphone is often a detective story, especially when the manufacturer is striving to create a monolithic case without unnecessary holes. If you wonder where Xiaomi has a microphone, you know: the company’s engineers have hidden it so that it does not catch your eye, but it effectively captures sound waves even in noisy environments. In devices of the Redmi Note series, Poco and the flagship Mi, a system of two or even three microphones is usually used to implement the noise reduction function.
The main module that handles voice transmission during a conversation is often hidden on the lower edge of the case, next to the charging jack or headphone gnesm. However, to ensure high-quality video recording and voice assistant, additional sensors are placed on the upper edge or in the area of the main camera. Understanding this logic will help you not only find the physical hole, but also to properly adjust the software settings for the perfect sound.
It's important to consider that in models with an infrared port on the top edge, there can be confusion: a small black window of an infrared sensor is often mistaken for an input for sound, although these are completely different components. Let's figure out how not to confuse them and where exactly to look for the cherished hole depending on the specific modification of your gadget.
Physical location of the microphone on different models
Sound architecture is very much dependent on the class of the device and the year it was released. In budget models like the Redmi 9 or 10, you'll most often find a classic circuit: one hole at the bottom right of the USB-C port and one at the top in the center. That's enough for basic noise cancellation and voice transmission. The hole at the bottom is the main one, which is where you talk in hands-free and voice recorder mode.
Flagship lines like the Xiaomi 12 Pro or 13 Ultra can have a more complex configuration. There is often a third microphone located on the back of the camera block. It is necessary for recording spatial sound (Zoom-in Mic) when shooting video when you zoom in, and the sound automatically focuses on the subject.
⚠️ Warning: Do not use sharp objects such as needles or pins to clean the microphone holes.You can pierce the sensor membrane, resulting in irreversible sound distortion or complete loss of sensitivity.
In some protected models or devices with an unusual form factor, the holes can be offset to the side edges, but this is more the exception than the rule.If you can't find the hole visually, try gently swiping your finger along the faces - often the microphone's protective mesh feels like a slight roughness or indentation in smooth metal or glass.
It is also worth mentioning the models with mechanical lifting of the camera, where the upper microphone is sometimes hidden in the end of the body to preserve the symmetry of the design with the retractable mechanism, in which cases the hole can be barely noticeable and merge with the antenna inserts.
How to check the microphone on Xiaomi
Before you take a device into a service or disassemble it, you need to make sure that the problem is in the hardware, not the software failure. The easiest way is to use the standard Dictophone app. Record a short piece of speech in a quiet room, and then play it back. If you hear yourself clearly and without wheezing, then the main bottom module is working.
For a deeper diagnosis, you can use the engineering menu, which is hidden from ordinary users. To get there, open the Phone app and type the combination ##6484##. In the CIT (Customer Inspection Test) menu, you need to find an item associated with audio, such as Receiver or Mic.
Inside the test mode, you will be asked to talk to your phone, and then the system will give you a PASS (success) or FAIL (error), which is the most reliable way to check not only the main microphone, but also the second (noise suppressing) microphone, if the test includes checking both channels.
- 🎤 Test voice recorder: record a voice message and send it to your messenger to assess the quality of compression and transmission.
- 📞 Call check: Call someone and ask them to rate the volume of your voice by switching between normal mode and hands-free.
- 📹 Video recording: Take a short video from the rear camera while speaking next to the lens to check whether the upper or rear microphone is working.
If you have a bug on the engineering menu, but you have a problem with sound in life, maybe calibration is a problem, and in rare cases, resetting to factory settings helps, but it's an extreme measure that requires prior backup.
☑️ Diagnostics of sound
Sensitivity and noise reduction adjustment
Modern MIUI and HyperOS shells provide advanced audio management capabilities that often remain hidden in the depths of the menu. If your interlocutor complains that you are not audible or the recording is quiet, it is worth checking the availability settings. Go to Settings → Advanced Settings → Special features, where you can find sensitivity sliders.
The noise cancellation function works automatically, cutting off the background hum, but sometimes it can be too aggressive, "eating" part of your speech. Some Xiaomi models have a separate "Write Improvement" or "HD Voice" switch that should be activated to improve voice quality on LTE and VoLTE networks.
⚠️ Warning: When you turn on the "Record Improvement" mode in noisy places (metro, street), the phone may begin to distort the voice, trying to filter out extraneous sounds, making speech robotically.
It's important for video bloggers and content creators to know about the Audio Zoom feature, which activates automatically when the camera is approaching and uses a second microphone to focus on the sound source in the frame, and make sure that the camera settings don't limit the use of external microphones if you plan to connect the loop.
Also worth paying attention to the settings of specific applications. Messengers like Telegram or WhatsApp may have their own internal filters that conflict with the system settings of Xiaomi.
Problems with protective covers and accessories
One of the most common but common causes of bad sound is a misfitted protective case. Accessories manufacturers don't always take into account the exact location of the holes, especially in models that go to market at high speed. Dense silicone or thick plastic can block the microphone's inlet, jamming the sound.
If you notice that you're hearing worse after buying a new case, take it off and test again, often solved by simply replacing the accessory with a model with a precise perforation or wider cutouts at the bottom of the case.
In addition, protective films that are not properly applied can seal the microphone hole, and although this is rare, when you install a hydrogel or glass film, the master sometimes accidentally closes the technical holes, thinking that it is just a decorative element.
| Accessory type | Impact on sound | Recommendation |
|---|---|---|
| Silicone case | Partial overlap of the hole | Check for cutout matching |
| Glass film | Risk of sealing the hole | Carefully cut through the hole |
| External microphone | Internal shutdown | Check the compatibility of the connector |
| Bluetooth headset | Switching the sound channel | Set the device's priority |
What to do if the cover covers the microphone?
Cleaning and maintenance of the microphone
Over time, the microphone mesh gets clogged with dust, pocket pile and skin fat, which significantly reduces the volume of the recording. You can't use liquids directly to clean the mesh, moisture can get inside and oxidize the contacts. The best method is to use a soft dry toothbrush.
Carefully, without much pressure, brush along the microphone hole, sweeping the dust out. You can also use sticky tape (scotch) to glue and peel it over the hole to pull out the contaminants. The compressed air in the cans is also effective, but you need to blow at an angle, not perpendylyarno, so as not to drive the dust deeper.
⚠️ Warning: It is strictly forbidden to use a vacuum cleaner to clean the microphone.The vacuum pressure created can damage the thin membrane of the sensor, and it will be impossible to restore it after that.
If the sound didn’t improve after cleaning, it might not be the pollution that caused the problem, but the software failure of the audio drivers, in which case the device reboots or checks for system updates, as Xiaomi regularly releases patches that fix the audio subsystem.
Use of external microphones
For professional sound recording, the built-in capabilities of the smartphone may not be enough. Xiaomi supports the connection of external USB-microphone OTG. This allows you to connect a studio condenser microphone and get professional quality sound.
When you connect an external device, the system automatically switches audio input. If this does not happen, check the settings in Settings → Connections and Sharing → USB. Here you can select a mode of operation, such as "File Transfer" or "MIDI", which sometimes helps the system recognize the audio device.
For models without a 3.5 mm (mini-jack) connector, USB-C adapters will be needed. It is important that the adapter supports audio transmission (DAC), not just charging. Cheap "charging only" cables will not transmit sound from an external microphone.
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When recording an important interview or lecture, always record a parallel recorder on another device or a cloud service to protect yourself from an accidental failure of the main gadget.
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External microphones via USB-C provide the best sound quality, but require adapter compatibility checks and support for the OTG protocol in your version of MIUI.