Connecting wireless headphones to Xiaomi Redmi 9 via Bluetooth: instructions and tips

Wireless headphones have become an integral part of everyday life – they are convenient for listening to music, talking on the phone and even watching videos. Owners of Xiaomi Redmi 9 often face the question of how to connect headphones using Bluetooth to avoid problems with connection or sound quality. In this article, we will analyze the connection process by steps, consider possible errors and give recommendations for optimizing the work.

Despite the apparent simplicity, connecting headphones via Bluetooth can be difficult — especially if you are doing this for the first time or using headphones not from Xiaomi. For example, some models require pre-charging or activation of pairing mode, and in the settings of the smartphone can be hidden important parameters.

Preparation of headphones and phone to connect

Before you start pairing, make sure both devices are ready to connect.

• 🔋 Charging headphones: Most wireless models require a minimum charge level (usually a charge level). 10-20%) If the light on the body is not lit or flashes red, connect the headphones to the charger on the device. 10-15 minute.
• 📱 Pairing mode. The activation process is different from one model to another: For Xiaomi AirDots, hold the button on the case of the charging case. 3-5 It's a second before the light flashes white. WH-1000XM4 — press the power button on 7 You hear a voice message saying "Bluetooth pairing." JBL Tune 120TWS — Take the headphones out of the case and hold the button on each of them on the case. 3 seconds.
• 🔍 Reset. If the headphones have already been connected to another device, you may need to reset. This is usually done by holding the power button to the power button. 10-15 seconds (before the color of the indicator changes).

Now prepare the Xiaomi Redmi 9 smartphone:

• 📶 Turn on Bluetooth. Swipe down the screen to open the Quick Settings panel, and tap the Bluetooth icon. Or go to Settings. → Connections and sharing → Bluetooth.
• 🔄 Update your firmware. Outdated software can cause connection problems. Check for updates in Settings → The phone. → Updating the system.
• 🚫 If other devices (fitness bracelet, speaker) are already connected to the phone, temporarily turn them off to avoid conflicts.

⚠️ Note: If you use Bluetooth 5.0-enabled headphones (like Xiaomi Air 2 Pro) and your Redmi 9 runs on an older version (4.2), some features (like low sound latency) may not be available. → The phone. → Full specifications → Bluetooth.

Step-by-step instructions for connecting headphones

When both devices are ready, start pairing. Follow the instructions carefully to avoid errors:

1. Activate the search mode on the headphones. We told you how to do this in the previous section. Usually, a flashing indicator (white or blue) signals a successful activation.
2. Turn on Bluetooth on Redmi 9. Open Settings → Connections and Sharing → Bluetooth and move the slider to the right. Wait until the smartphone starts scanning the available devices.
3. Select your headphones from the list. In the "Available devices" section, the name of your headphones will appear (for example, "Mi True Wireless Earbuds Basic 2").
4. Confirm pairing. A request for code confirmation (usually 0000 or 1234) may appear on the screen, enter it and press "Connect." Some models (such as AirPods) do not require code.
5. Wait until the connection is complete. When the headphones connect, the device list will say "Connected" (or "Connected"), and the indicator on the headphones will stop flashing or will start to burn constantly.

If the headphones support multipoint (simultaneous connection to two devices), you can also connect them to a laptop or tablet. To do this, re-activate the pairing mode on the headphones and perform the same actions on the second device.

Headphones charged (indicator lights green or white)|

Bluetooth on your phone is enabled and visible for other devices |

Headphones in pairing mode (blinking indicator)|

No other active Bluetooth devices within 1 meter radius |

Power saving mode is turned off on the phone (may interfere with the connection)-->

Solving common connection problems

Even if you do the instructions correctly, you can have some problems, and let's look at the typical problems and how to fix them:

If none of these things worked, try resetting your phone’s network settings. Go to Settings → System and Device → Additional → Settings Reset → Resetting your Wi-Fi, mobile network and Bluetooth settings. This operation will delete all your Bluetooth devices, so you’ll have to reconnect your headphones after the reset.

⚠️ Note: Some headphones (such as Sony) WH-1000XM3) They may be in conflict with energy saving regimes. MIUI. If the sound is interrupted when the phone’s battery is low, turn off optimization for the Bluetooth app in Settings. → Annexes → Application management → Bluetooth → Battery → No restrictions.

Customize the sound quality and Bluetooth codecs

By default, Xiaomi Redmi 9 uses a standard SBC codec that provides average sound quality. If your headphones support more advanced codecs (such as AAC, aptX or LDAC), you can manually select a priority codec to improve the sound.

To change the settings:

1. Put the headphones on the phone.
2. Open Settings → Connections and Sharing → Bluetooth.
3. Put the pin on the gear badge (⚙️) near the name of your headphones.
4. Select "Sound Quality" or "Audio codec" (in some firmwares, this item may be called "Additional settings").
5. In the list of available codecs, choose the best option: AAC is the best balance between quality and stability (recommended for AirPods and most headphones). aptX is high quality, but can cause delays (suitable for watching video); LDAC is maximum quality (up to 990 kbit / s), but requires powerful headphones and can be interrupted. SBC is versatile, but with mediocre sound.

After you change the codec, the sound may be temporarily interrupted -- that's OK. If you notice interference or delay, go back to the SBC or AAC.

💡

If you don’t have “Sound Quality” in your Bluetooth settings, install the Developer Options app from Google Play and activate Developer Mode. Then, in Settings → Additional → For developers, find the “Bluetooth Audio Codec” option and select the desired codec.

How to connect headphones to Redmi 9 in developer mode

Sometimes standard MIUI settings don't allow you to fully configure Bluetooth, and then the developer mode that gives you access to additional settings will help, and here's how to activate and use it:

1. Enable Developer Mode: Go to Settings → About the phone, tap 7 times on "version" MIUI". You will receive a notification saying, “You are a developer!".
2. Configure Bluetooth settings: Return to Settings → Additional → For developers. Find the Network section and turn on the Bluetooth Debugging option. In the same section, select Bluetooth Audio Codec and set the priority codec (e.g., aptX HD if your headphones support it). Activate Absolute Volume to synchronize volume on your phone and headphones. Optimize the connection: Enable "Hold Wi-Fi adapter while you sleep" (this indirectly improves the stability of Bluetooth devices).

Be careful with the developer settings - incorrect changes can cause the phone to crash.If there are connection problems after the changes, reset your Bluetooth settings or turn off the developer mode.

How to turn off and reconnect the headphones

If you need to temporarily turn off your headphones (for example, to connect them to another device) or reconnect due to a failure, follow this instruction:

Turn off the headphones:

• 📱 Through the notification panel: Swipe down from top to top to open the Quick Settings panel. Press and hold the Bluetooth icon (⚙️) Next to the headphone name. Select "Disable".
• 🔌 Through the case (for TWS-Headphones: Put your headphones in the charge case. Close the lid, the connection will break automatically.

1. Press and hold the power button on the headphones for 3-5 seconds until the indicator starts flashing red.

Reconnect:

• 🔄 Automatic: Get your headphones out of the case (if it's the case) TWS-They must be connected automatically during the 5-10 seconds.

1. Activate the pairing mode on the headphones (see the section "Preparation").
2. On the phone, open Settings → Bluetooth.
3. Slip on the headphones in the list "Conjugated devices".

If the headphones don’t automatically connect, check if the “Auto Connection” option is enabled in their settings (the gear icon next to the device name in the Bluetooth list).

Tips for saving battery power when using Bluetooth

Using Bluetooth increases Xiaomi Redmi 9 battery consumption by 5-15% depending on the codec and volume. To extend the phone’s life, follow these guidelines:

• 🔋 Optimize the codec. SBC It consumes less energy than aptX or LDAC. If the sound quality is not critical, select SBC customized.
• 📉 Turn it down. The louder the sound, the more energy the headphones and the phone use — 60-70% high-pitch.
• ⏳ Turn off Bluetooth when you're not using. Even in standby mode, the Bluetooth module consumes the charge. Turn it off if the headphones are in the case.
• 🔄 Update your firmware. Manufacturers regularly optimize their power consumption. Check for updates in Settings. → The phone. → Updating the system.
• 🛡️ Use the energy saving mode. MIUI There's a Battery mode that restricts background activity. → Battery and productivity → Battery mode.

To improve the sound in Bluetooth settings, select the AAC codec.