Cleaning the speaker Xiaomi Mi9 SE: step-by-step guide with photos and tips

Why does the Mi9 SE speaker start to wheez or sound quieter?

Xiaomi Mi9 SE speakers lose sound quality over time, not because of electronics breakdown, but because of the accumulation of microparticles of dust, pile from clothes or even potassium deposits. The lower speakers are especially vulnerable - they are located next to the USB-C connector, where dirt from pockets or bags actively penetrates. Owners of the Mi9 SE often complain of muffled sound when listening to music or wheezing during phone conversations.

The problem is compounded by the design of the model: the Mi9 SE speaker grid has small holes (about 0.3 mm) that quickly clog. Unlike flagship devices, there is no active IP53 dust protection, so cleaning is required more often. But the good news is that 90% of the time, sound is recovered without visiting a service center.

Signs of a clogged speaker: when it's time to clean

The volume reduction is not always due to pollution, so to avoid wasting time, check these symptoms:

• 🔊 The sound is quieter in only one speaker (upper or lower), and the second one works normally.
• 🎵 Music and video are played with wheezing at high frequencies (especially noticeable in vocals)
• 📞 During calls, the interlocutor complains that he does not hear your voice well (the microphone next to the speaker is clogged)
• 🌫 Visually, under the grid dynamics visible gray divorces or villi

If the problem is only when you plug in your headphones, it's not the speakers, it's the 3.5mm jack or Bluetooth module, and then cleaning the speakers won't help.

Preparation for cleaning: what will be needed

The Mi9 SE speakers do not need professional tools to clean them safely, and there are enough tools available at home:

⚠️ Warning: Never use metal objects (needles, pins) - they can damage the speaker membrane. Also avoid water-based liquids: getting moisture under the grid leads to corrosion of contacts.

If you have an ultraviolet lamp, you can use it to disinfect you after cleaning -- just hold your smartphone for 5-7 minutes -- and it will kill bacteria that often accumulate in the speakers.

Method 1: Dry cleaning with toothpick and scotch

It's the most gentle method that's suitable for regular care, and it removes up to 70 percent of the contaminants without the risk of damaging the internal components.

1. Turn off your smartphone and get it out. SIM-map (vibration when turned on can shake the dirt inside).
2. Carefully run the speaker with a toothpick across the grid, slightly pressing. Move from center to edges so as not to drive the dirt deeper.
3. Cut a 2-3 cm piece of tape, fold it sticky side outwards and press it gently against the net. Repeat 3-4 times.
4. Walk along the edges of the speaker with a soft brush to remove the remaining particles.

Use wet wipes without pressing

Press the dynamics center (there is a membrane)

Blow with your mouth - saliva will get inside

Use a vacuum cleaner (may damage the microphone)-->

Important for the Mi9 SE: The bottom speaker of this model has an asymmetrical arrangement of the holes - on the left they are larger. Start cleaning on the left side, where more dirt accumulates.

Method 2: Purging with compressed air

The compressed air tank, sold in electronics stores, removes dust from deep layers that the toothpick won't get to, but there's a nuance here.

• 🎯 Keep the balloon vertically (do not tilt) to avoid liquid ejection
• 📏 Distance to speaker — 3-5 See Closer - you can damage the membrane by air flow
• 🔄 Blow through with short pulses (1-2 seconds, not continuously

After purging, be sure to walk with a brush - the air expels dirt to the surface of the mesh. If there is no balloon, use a dryer in cold mode (hot air deforms the plastic of the case).

💡

Before purging, stick a piece of paint tape with a hole in the size of the mesh on the speaker, which will protect the body from accidental scratches when the balloon is awkwardly moving.

Method 3: Wet cleaning (for persistent contaminants)

If the speaker is covered with a sticky coating (for example, after getting sugary drinks), dry methods will not help.

1. Moisten the cotton swab in 70% alcohol (not vodka!) and squeeze it so it is barely wet.
2. Carefully run around the edges of the grid without touching the center. The alcohol quickly evaporates before it can get inside.
3. To remove dried drops, use a toothbrush soaked in alcohol (the bristles should be almost dry).
4. Let the smartphone dry for 10-15 minutes before turning on.

⚠️ Warning: If the sound is even quieter after wet cleaning, it means that the alcohol has leaked under the grid and dissolved the contaminants that now block the membrane.

Method 4: Ultrasonic cleaning (for advanced)

This method is used in service centers, but it can be repeated at home if you have an ultrasonic bath (for example, for cleaning jewelry), suitable for removing deep contaminants without disassembling:

1. Remove the back cover of the Mi9 SE (need a mediator and a hair dryer to soften the glue).
2. Disconnect the speaker plume from the motherboard (remember the location of the contacts!).
3. Place the speaker in a distilled water bath for 3-5 minutes at 40°C.
4. After cleaning, dry the speaker for 12 hours in a rice container (rice absorbs moisture).

This is a risky approach for beginners, because if you unplug the plume, you can damage your contacts, and if you're not sure about your skills, you should go to the master.

How to protect the Mi9 SE speakers from pollution

To clean the speakers less often, follow these tips:

• 📱 Use a speaker-protected case (e.g. Spigen or Ringke models with raised edges)
• 🧹 Regularly remove garbage from your pockets where your phone is located.
• 🚿 Avoid using your smartphone in dusty rooms (construction sites, workshops)
• 🔋 Do not put the phone speaker down on soft surfaces (sofas, carpets) – the pile clogs holes

For extra protection, you can put a special membrane on the speaker (sold in smartphone accessories stores), which lets in sound, but traps dust, the main thing is to cut it right along the contour so as not to block the holes.

💡

Regular cleaning of the Mi9 SE speakers (every 3-4 months) extends their service life by 30-40%, which is cheaper than replacing the speaker in the service, which will cost 1/5 of the cost of the smartphone.

FAQ: Frequent questions about cleaning speakers