How to Clean the Speaker on Xiaomi Redmi Note 9: 5 Proven Methods

Xiaomi Redmi Note 9 is one of the most popular smartphones in the budget segment, but even it is not immune from the typical problem: over time, speakers begin to wheez, the sound is distorted or completely disappears. The reason for this is dust, fabric fibers, potassium deposits and even microparticles penetrating through the protective grid. If you notice that your phone has become worse than the playback of music or the interlocutor does not hear you during calls, most likely, the speakers require cleaning.

In this article, we will discuss 5 safe ways to clean the Redmi Note 9 speakers, including mechanical and software methods, and also tell you what you can not do to avoid damaging the acoustic system. You will learn which tools you can use and which you should refuse to avoid making the problem worse.

Before you start the procedure, it's important to understand that the Redmi Note 9 has two speakers, the top (conversational) and the bottom (multimedia). Their design is different, so the approach to cleaning will be different. If you've never cleaned the speakers before, start with the most gentle methods and only if they are ineffective move on to more radical ones.

Why the Redmi Note 9’s speakers are getting polluted and how it’s manifesting

The main cause of the clogging of the speakers is microscopic particles that penetrate the protective grid.

• 🌫️ Dust and dirt from the environment (especially if the phone is often lying on a desk or in a bag without a cover).
• 🧵 Fabric fibers from pockets of clothing or covers (cotton, wool, synthetics).
• 💦 Moisture and sweat - when used actively on the phone, a greasy plaque settles, which attracts dust.
• 🍟 Crumbs and garbage – if you eat next to your phone or put it on unclean surfaces.

Pollution manifests itself differently depending on the degree of contamination:

If you notice any of these signs, you should start cleaning up, but first make sure that the problem is the contamination, not the software failure.

1. Check the volume in the settings (Settings) → Sound and vibration).
2. Restart your phone – sometimes the sound is lost due to temporary errors.
3. Test the speakers using the engineering menu (we will talk about this below).

Preparation for cleaning: what you need and precautions

Before you start the procedure, prepare the necessary tools and materials, most of which will be at home:

• 🪥 Toothpick or plastic spatula (not metal!).
• 🖌️ Soft brush (suitable for drawing or makeup).
• 🧻 Cotton swabs (better with a plastic rod).
• 💨 Compressed air canister (optional, but very effective).
• 🧴 Alcohol wipes or isopropyl alcohol (for disinfection).
• 🔍 Lunch or flashlight (to better see contamination).

What can't be done:

⚠️ Warning: Never use metal objects (needles, pins, knives) - they can damage the protective net or membrane of the speaker. Also avoid wet wipes with aggressive chemical compounds (for example, for cleaning the house) - they can eat glue or coating.

Before cleaning:

1. Turn off your phone to avoid accidental tapping.
2. Take off the cover and film (if any).
3. Check the speakers for visible damage.

Turn off the phone.

Remove the cover and protective film

Prepare tools (tassel, cotton swabs, alcohol)

Examine the speakers for damage

Test the sound before and after cleaning-->

Method 1: Dry brushing and cotton swabs (the safest method)

This method is suitable for regular prevention and removal of surface contaminants, it does not require disassembling the phone and is completely safe if done carefully.

Step-by-step:

1. Take a soft brush (for example, for watercolor or makeup) and gently run it along the grille along the (not across!) grille, which will help remove dust and fibers without pressing them deeper.
2. For the bottom speaker, use a cotton swab slightly soaked in isopropyl alcohol (don't overdo it with moisture!) and run it around the edges of the grille where the dirt accumulates most.
3. If contaminants are visible deep in the holes, it is possible to easily blow the speaker through the mouth (not too much so as not to damage the membrane).

For better effect:

• 🔦 Use a flashlight to light the speaker at an angle so you’ll see pollution better.
• 🔄 Repeat the procedure 2-3 times, changing the direction of the brush.
• 🎵 After cleaning, check the sound by calling another phone or turning on music.

This is a method that works 70 percent of the time if the pollution is shallow, and if the sound doesn't improve, go to the next method.

💡

To clean the bottom speaker Redmi Note 9 conveniently use a toothpick with cotton: wrap the tip of the toothpick with a thin layer of cotton, moisten in alcohol and gently walk through the grille, so you get to hard-to-reach places without risking damage to the membrane.

Method 2: Compressed air cleaning (for deep contaminants)

If the brush and cotton swabs didn't work, and you can see clearly dust or debris in the dynamics, you can use a compressed air spray, which is effective at removing particles from the back of the lattice, but it requires caution.

How to clean properly:

1. Keep the spray vertically (do not tilt to avoid the liquid being ejected!).
2. Spray air with short pulses (1-2 seconds) from a distance of 5-7 cm.
3. Direct the jet at an angle of 45.°, Not perpendicular to the membrane.
4. After processing, let the phone stand for 10-15 minutes to evaporate possible moisture.

⚠️ Warning: Do not use a vacuum cleaner or compressor - too much airflow can tear the speaker's membrane. Also, do not blow too much with your mouth: saliva contains enzymes that can damage the internal components.

If the sound is better after air cleaning, but the wheezing is still there, try combining this method with a dry brush. For persistent contamination, you may need to disassemble the phone, but this is a last resort.

Method 3: Software-based speaker testing (diagnostics before cleaning)

Before you disassemble your phone or use radical methods, make sure that the problem is pollution, not software failure.

How to check the speakers through the engineering menu:

1. Open the phone app and dial the code: ##4636##
2. In the menu that opens, select Audio Testing (or Audio Testing).
3. Test Speaker (bottom speaker) and Earpiece (top speaker) alternately.
4. If the sound is distorted or absent, the problem is in the hardware (pollution or breakage).

An alternative way is to use the Phone Doctor Plus app (available on Google Play), which will test both speakers and show if there are problems with audio playback.

If the test shows that the speakers are working normally but the sound is still bad, the reason may be:

• 🔊 Equalizer settings (check in Settings) → Sound. → equalizer).
• 🎧 Connected headphones (sometimes the phone "sticks" in headphone mode).
• 📱 Software updates (sometimes sound bugs are fixed in new versions) MIUI).

💡

If the engineering menu shows that the speakers are working but the sound is distorted, 90 percent of the time there is mechanical contamination, and if the test doesn't work at all, it's possible that the speaker is damaged and needs to be replaced.

Method 4: Deep cleaning with partial disassembly (for power users)

If all previous methods have failed and the speaker is clearly littered with debris, you can try partial disassembly. This method is only suitable for those who have already dealt with phone repairs or are willing to take risks. Redmi Note 9 is relatively easy to disassemble, but there is a risk of damage to the plumes or mounts.

What you need:

• 🔧 Plastic blade (to open the body).
• ⚡ Screwdriver. T3 or T4 (screw).
• 🧲 Magnetic mat (so as not to lose the screws).
• 📸 Smartphone for shooting the process (so as not to confuse the details during assembly).

Step-by-step:

1. Turn off the phone and remove it. SIM-memory-card.
2. Heat the back cover with a hair dryer (temperature not higher than 60°C) for 1-2 minutes to soften the glue.
3. Carefully tuck the lid with a plastic blade, starting at the lower corner (where the charging connector is).
4. Unscrew all the screws holding the metal plate over the speaker.
5. Remove the plate and gently clean the speaker with a brush or cotton swab dipped in alcohol.
6. Collect the phone in reverse order, making sure all plumes are connected.

⚠️ Warning: When disassembling the Redmi Note 9, be careful with the flexible battery plume - it breaks easily! Don't pull it or bend it. Also don't force when removing the back cover - if it doesn't lend itself, warm it up again with a hair dryer.

If you are not sure of your abilities, it is better to contact a service center. The cost of cleaning speakers in most workshops does not exceed 500-800 rubles, which is cheaper than repairing after a failed disassembly.

Method 5: Prevention of speaker pollution

To avoid having to clean the speakers every few months, follow the simple rules:

• 📱 Use a case with speaker protection (for example, with raised edges).
• 🧼 Regularly wipe the phone with alcohol wipes (especially the charging and speaker connector).
• 🚫 Do not put your phone on soft surfaces (sofa, bed) - there is most dust and villi.
• 🎧 Avoid maximum volume – this increases the load on the speakers and attracts dust due to vibration.
• 🌧️ Do not use your phone in the rain or in the bathroom – moisture accelerates clogging.

It's also useful to blow the speakers once a month (without disassembly) with a compressed air can, which will remove dust that hasn't had time to penetrate deeply.

If you listen to music or watch videos often, install a sound quality control app like Wavelet, which will help you adjust the equalizer so that the speakers are working in a gentle mode.

Frequent errors when cleaning speakers and how to avoid them

Many users make the problem worse by trying to clean the speakers incorrectly, and here are the most common mistakes:

Another common mistake is ignoring the top speaker, and many people only clean the bottom speaker, forgetting that the top speaker clogs up too, especially if you're talking on the phone often with it pressed against your ear.

If the speaker sounds worse after cleaning than before, you probably:

• 🔊 I touched the membrane (it is very thin and sensitive).
• 💧 Wetness got inside the hull.
• 🔌 Damaged contacts speaker during disassembly.

In this case, it is better not to experiment further and take the phone to the service.

FAQ: Answers to Frequent Questions