Modern smartphones like the popular Xiaomi Redmi 9 allow you to completely abandon wires, providing high quality audio transmission. However, the process of initial setup or re-pairing devices sometimes raises questions for users, especially when using new models of headsets. In this article, we will discuss in detail all the stages of connection, from activating visibility mode to fine-tuning the codecs for maximum sound quality.
The right Bluetooth configuration is critical not only for music listening, but also for stable gaming and video calling, where audio delay is not acceptable. We'll look at standard procedures, and delve into the hidden settings of the MIUI system that will help eliminate common problems with audio and video desynchronization. Get ready to get the most out of your wireless acoustics.
Preparation of headphones and smartphone for pairing
The first step before setting up is to properly prepare both devices. Make sure your Redmi 9 is at least 20-30% charged, as active device search and subsequent data transfer can consume additional power. Also check that the wireless module on the phone is serviceable and is not in flight mode.
As for the headphones themselves, they need to be put into detection mode. For most models, this is done by holding the on button or special pairing button for a long time until the indicator starts flashing in blue or red-blue. TWS-Headset (True Wireless Stereo), often required to remove both headphones from the case and possibly touch touch touch areas to activate visibility.
It is important to understand that some headphone models automatically go into pairing mode only when they first turn on after buying or after resetting. If the device was previously associated with another phone, it may try to connect to it, ignoring requests from Xiaomi, in which case you must first disable Bluetooth on the old device.
⚠️ Warning: Do not bring your headphones too close to working Wi-Fi routers or microwave ovens during setup, as frequencies may overlap and interfere with stable device detection.
Successful preparation ensures that the phone will see the headset in the list of available devices. Without this stage, all further actions will be useless, so take time to check the indicators on the accessory case.
Step-by-step connection instruction via Android settings
Once the headphones are ready, pick up your Redmi 9 and unlock the screen. Find the Settings icon on your desktop or app menu, which usually looks like a gear, and we'll need the wireless interface section.
In the settings menu, find Bluetooth. In the MIUI shell, it can be at the top of the list or inside the Connect and Sharing group. Press the switch to activate the module if it is off. The system will automatically start scanning the space.
When your headset appears on the Available Devices list, tap it. You may see a request to confirm pairing with or without the code on the screen. Click OK or Confirm. In a few seconds, the status will change to Connected, and the status bar will show the corresponding icon.
☑️ Checklist of successful connection
If the connection is successful, the system may offer to configure additional features, such as contact sync or call history.
Advanced sound and codec settings in MIUI
Standard connectivity is often not enough for audiophiles or users wanting to make the most of the hardware. Xiaomi Redmi 9 has hidden developer settings that allow you to manage Bluetooth codecs, which affects bitrate and the quality of the transmitted sound.
To get to the developer menu, go to Settings → About Phone and quickly click 7 times on MIUI Version. After you notice that you have become a developer, go back to the main settings menu, select Additional and then For Developers. Find the Bluetooth-related section.
You can choose a Bluetooth Codec here. SBC is often the default, which provides basic quality. If your headphones support more advanced formats like AAC, aptX or LDAC, select them from the list, which will significantly improve the detail of sound when listening to music in high resolution.
What are codecs and what do they affect?
Also on this menu, you can find the "Absolute Volume Level" setting. If you notice that the volume of the headphones and phone is adjustable separately or too quietly, try changing the state of this switch and restart the device.
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For the best sound quality in games and videos, choose low latency codecs if your headset supports them to avoid image and audio out of sync.
Multi-device work and list management
Redmi 9 allows you to store many devices in memory, but at the same time, you can usually only work with one or two (depending on the version of Bluetooth and multipoint support).
To switch to another headset, just click on the name of the device you want in the list of "My devices." If it has been paired before, the connection will set up automatically. If the device does not respond, make sure it is on and nearby.
To remove old or unwanted devices, click on the gear icon or arrow next to the headset name and select Disable or Remove.This is useful if you have sold old headphones or are no longer in use to keep the list cluttered and speed up your search for new devices.
| Action. | The result | Recommendation |
|---|---|---|
| Shut down. | Breaking of the current connection | Used for temporary switching |
| Delete (Forget) | Complete deletion of profile | When selling or resetting headphone settings |
| Rename | Change of the displayed name | For convenience, differences in the same models |
Keep in mind that keeping a large number of profiles can theoretically (though minimally) affect the speed of the initial network scan, so periodic cleaning of the list is a good habit.
Solution: if the headphones are not connected
Despite the simplicity of the procedure, users often encounter errors, and the most common situation is that the phone sees the device but says "Unconnected" or "Pairing error." First of all, try to forget the device in the Bluetooth settings and create a pair again.
If the problem persists, check the battery power of the headphones. When the charge level is low, some models go into energy-saving mode and stop supporting a stable connection. Also, make sure that the Bluetooth drivers in the MIUI system are updated - check for system updates in the About Phone menu.
Sometimes, a complete reset of network settings helps. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Note: this action will delete all stored Wi-Fi passwords and associated devices.
⚠️ Note: Before resetting your network, make sure you remember passwords from important Wi-Fi networks, as it will be impossible to recover them from the system after resetting.
In rare cases, a conflict may be caused by a third-party app that controls the sound or the bluetooth headset. Try to start the phone in safe mode and check the connection.
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90% of connection problems are solved by completely removing the device from the list of paired devices and re-pairing with Bluetooth turned off on other nearby devices.
Optimization of connection autonomy and stability
The constant operation of the Bluetooth module affects the battery life of the Redmi 9. To minimize consumption, the system can limit the background activity of applications using audio. If music is interrupted when the screen is off, add your player to the battery exception list.
Go to Settings → Battery and Performance, find the app you are using (like Spotify or YouTube), and set the “No Limits” mode to prevent the system from aggressively shutting down the process.
- 🔋 Turn off Bluetooth when not in use, through the notification curtain.
- 📡 Keep your phone in your pocket or bag, avoiding shielding the signal between your phone and headphones.
- 🔄 Regularly update the firmware of the headphones themselves through the branded applications of manufacturers.
Following these simple rules will allow you to enjoy your favorite tracks longer and without interruptions. Bluetooth technology is constantly evolving, and the right use of its capabilities makes interaction with gadgets really convenient.