Xiaomi’s modern smartphones are sophisticated engineering devices where every millimeter of interior space is carefully designed. Owners often face the need to find the exact location of audio modules, especially when it comes to cleaning, repairing or diagnosing sound problems. The question of exactly where the speaker is may seem trivial, but in an era of frameless screens and hidden technology, the answer to it becomes obscure.
Understanding your device’s acoustic architecture will not only help you maintain your device efficiently, but also avoid common operating errors. For example, improper installation of a protective glass or cover can block vital acoustic channels. In this article, we will take a closer look at the design of the sound system in the Redmi and POCO ranges so you know exactly where the sound is going.
It is important to distinguish between the two main types of sound emitters used in these smartphones: the spoken (audible) and the multimedia (main) and their location is radically different, and they should not be confused when conducting maintenance procedures. We will look at physical holes, hidden channels and technological solutions, such as Sound by Harman Kardon, which change the familiar geometry of the case.
Types of speakers in Xiaomi smartphones
The first thing to understand for proper navigation on the body of the device is the separation of functions of the audio modules. The vast majority of modern Xiaomi models use a stereo system consisting of two independent or cooperative sound sources. The conversational speaker is designed solely to transmit the voice of the interlocutor during a call and usually has a smaller size and specific frequency characteristics.
The second component is a multimedia speaker, which is responsible for playing music, video, game effects and notification sound. This module is most often affected by pollution or mechanical damage, as it emits more powerful low-frequency oscillations. In some budget models, manufacturers can use one main speaker and a second auxiliary, paired with a conversational one to create a pseudostereo effect.
Technology is constantly evolving, and the company is introducing solutions where the second speaker is the speaker itself, reinforcing its power by software methods, allowing for symmetrical stereo channels, which is especially noticeable when watching video in a horizontal position, but the physical location of the holes remains a key factor in accessing the insides of the device.
It is worth noting that flagship models often use more sophisticated, volume-enhanced acoustic cameras to improve bass, and the acoustic channel in such devices can be lengthened, passing from the real speaker to the outlet inside the case, creating the illusion of the location of the sound source elsewhere.
Location of the Speaking Dynamic
Traditionally, the speaker is at the top of the front of the smartphone. In classic models with a visible top frame, this hole is easy to find: it is a narrow oblong slot or a series of micro holes directly above the display.
In devices with a cutout (" bang") or a hole in the screen (Punch-hole), the speaker is often hidden in the thinnest gap between the body and the glass of the display. In some cases, especially in protected models or devices with subscreen technology, there may be no visible hole at all, in which case the sound passes through a special gap that is invisible to the eye, or through the design of the screen itself.
Don't confuse a conversational speaker with an approximation sensor or a front-facing camera. Although they're often in the same upper zone, the acoustic module has its own specifics. If you try to clean the sensor thinking it's a speaker, you can damage the sensitive optics or light sensor.
Mi Sound Technology
To test the performance of this module, you can use the engineering menu. Enter the code ##6484## and select the Receiver test, which will give a test signal and determine exactly where the sound is coming from, even if the visual hole is hidden.
Where is the main multimedia speaker
Finding the primary sound source that is responsible for loud playback of content usually leads us to the bottom of the device. 90% of the time, the multimedia speaker is located inside the housing at the bottom, and the sound is output out through a perforation near the charging port. Often users mistaken microphone holes for part of the dynamic system.
The design of the lower end can be symmetrical or asymmetrical. In symmetrical models, the holes are located on either side of the USB Type-C connector, which creates a visual balance, although only one side can work. In asymmetric models, the speaker is shifted left or right, and on the other side there is only a microphone or process plugs.
It's important to understand that the speaker is inside the body, and the visible holes are just the output channels of the acoustic system. There may be a distance of several millimeters between the speaker and the hole, and the channel itself is protected by a moisture-retarding membrane, and damage to this membrane when brushed with sharp objects can lead to loss of leakage and deterioration of sound quality.
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Use a soft toothbrush to clean the speaker mesh carefully.Do not use sharp objects such as needles or pins to avoid piercing the protective membrane.
Some Black Shark games or special edition Xiaomi games may have additional output holes on the side faces, so that your fingers don’t overlap the sound when you grab the device horizontally. Always check the side ends if you don’t find the expected perforation from the bottom.
Hidden channels and technological holes
Modern design dictates its rules, forcing engineers to hide functional elements. Often, the acoustic channel passes through the inside of the case, using the free space between the battery and the back cover, which allows you to take the output of sound to an unexpected place, such as the upper end of the device, even if the speaker is on the bottom.
In ceramic or glass-framed models, the holes can be made as microscopic perforations, invisible without a magnifier, and these solutions are used to keep the design monolithic, and if you swipe along the frame and feel a slight vibration or airflow, you have found a hidden output of sound.
Special attention should be paid to models with Dolby Atmos technology. It requires accurate calibration of the channels to work properly, and any overlapping of the holes with a cover or dirt violates the spatial sound algorithms.
The table below shows a comparison of the location of speakers in popular series of smartphones, which will help you quickly navigate the design of your device.
| Xiaomi Series | Location of conversational | Location of the main | Features |
|---|---|---|---|
| Xiaomi Mi / Number Series | Top frame (hidden) | Lower end | Stereosound by Harman Kardon |
| Redmi Note | Top frame (seems) | Lower end (right) | Classical scheme |
| POCO F / X | Top frame (slit) | Lower end (left/right) | Play acoustics |
| Redmi (budget) | Top frame | Lower end (mono) | One main channel |
Diagnosis and performance testing
Before you start disassembling or aggressive cleaning, you need to make sure that the nature of the problem is clear. Often, the "loss" of sound is not due to a break in the speaker, but to a software failure or channel lock, the first step should be software diagnostics through the built-in tools of the MIUI or HyperOS system.
Use the test mode to test each channel separately, so you can see if the top speaker, the bottom speaker, or both are working, and if there's sound in the test but there's no sound in the applications, the problem is the settings of the equalizer or the particular application, and if there's no sound anywhere, maybe the plume has gone off or the winding has burned.
Notice the behavior of the sound membrane, and if you hear wheezing or rattling at maximum volume, it may indicate that moisture or dust is entering the acoustic chamber, and in such cases, a simple purge may not help, it may require disassembly and replacement of the module.
⚠️ Warning: If the sound is gone after water hits, do not try to dry the phone with a hairdryer in hot mode. High temperature can melt the adhesive layer of the speaker and permanently disable it.
Also worth checking is the sound balancing settings. In Settings → Sound and Vibration → Balance slider can be accidentally shifted into one of the channels, causing one of the speakers to be silent. This is a common situation after connecting third-party headphones or adapters.
Cleaning and maintenance of the acoustic system
Regular maintenance of the sound holes is the key to sound quality and long life of the device. Dust, pile from pockets and skin fat over time clog the speaker grid, reducing the volume and distorting the frequencies. Effective cleaning of the acoustic channels does not require complex equipment, but you need accuracy.
Start with a dry brush with a soft brush or toothbrush. In light circular movements, walk along the perforation to knock out the dry dust. Then you can use a sticky tape (scotch), applying it with the glue side to the holes to pull out the small villi. Don't use water or alcohol directly on the mesh, the liquid can leak in and damage the magnet.
☑️ Checklist of cleaning the speaker
For complex contaminants, you can use special gel cleaners or smart dust that penetrates the pores and draws out dirt, but with such tools you need to be extremely careful not to let them get on the screen or into the charging connectors.
⚠️ Attention: It is strictly forbidden to use compressed air from high-pressure canisters.A powerful jet can damage the thin membrane of the speaker or drive dust even deeper into the body.
If the cleaning didn't work and the sound remains quiet or hoarse, it may be the oxidation of the plume contacts or the mechanical damage to the speaker, which would require opening the back cover and replacing the component.
Frequent problems and their solution
One of the most common problems is when the speaker suddenly stops talking after a system upgrade or a device crash. If the software reset doesn't help, check the physical condition of the connector. If the plume is hit hard, the speaker plume may move away from the board and need to be corrected.
Another common complaint is a quiet sound in talk mode, often due to contamination of the upper speaker or adhesion of a protective glass that covers the acoustic channel, and make sure that the screen screen protector is properly cut and does not cover the upper slot.
In rare cases, there is a software conflict where the sound is only through one channel. Check if the Mono mode is enabled in special features. Also worth paying attention to the settings of Dolby Atmos, sometimes switching profiles (Music, Movie, Auto) solves the problem of imbalance.
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If software methods and cleaning do not help, a hardware speaker replacement is most likely required, as the winding may have burned out or the magnet demagnetized.
Remember that self-replacement of the speaker is possible, but requires the presence of a thermophen to remove the back cover and accuracy when working with plumes. If you are not confident in your abilities, you should contact an authorized service center.