How to connect a subwoofer to the Xiaomi soundbar: 3 proven ways

Xiaomi soundbars are a popular home theater sound enhancement solution, but without a subwoofer, low frequencies are often lost, making the bass weak and inexpressive. Connecting an external subwoofer can dramatically change the sound by adding depth to explosions in action movies, power to musical compositions and realism to sound effects in games. However, not all users know how to properly synchronize these devices, especially if we are talking about models with wireless connection.

In this article, we will discuss three main ways to connect a subwoofer to the soundbars of Xiaomi Mi Soundbar, Redmi Soundbar and other models of the brand: via Bluetooth, cable connection and Wi-Fi (for supported devices), and you will learn how to configure sound synchronization, avoid delays and eliminate typical problems. If your subwoofer is not recognized by the system or emits extraneous noises, at the end of the article there is a section with solutions.

1.What subwoofers are compatible with Xiaomi soundbars

Before you buy or plug in a subwoofer, make sure it is compatible with your soundbar model. Xiaomi releases as its own subwoofers (e.g. for Mi). TV Soundbar, which supports third-party devices, is the key:

• 🔹 Original Xiaomi subwoofers: Perfect as they were designed for specific soundbar models. Example: Xiaomi Mi TV Soundbar Subwoofer for Mi Soundbar 3.1ch. Connect automatically via proprietary protocol.
• 🔹 Universal wireless subwoofers: Bluetooth or Wi-Fi Direct. It is important that profiles are maintained A2DP (for streaming and AVRCP (steer).
• 🔹 Wireless subwoofers: Requires a Sub Out output (RCA Or 3.5 mm on a soundbar, and models with an active amplifier (have their own power supply) are suitable).

If you use a subwoofer from another manufacturer (for example, JBL, Sony or Edifier, check its specifications for supported protocols. For example, the Redmi Soundbar Pro soundbar has no Sub Out output, so only wireless subwoofers can be connected to it.

⚠️ Note: Passive-designed subwoofers (without built-in amplifier) are not suitable for connecting to Xiaomi soundbars. They require an external amplifier that is not present in these devices.

2. Connecting subwoofer via Bluetooth: step-by-step instructions

Wireless connectivity is the most versatile way, because it requires no additional cables and works with most modern subwoofers, but it has drawbacks: possible delays of sound (up to 100-200 ms) and dependence on interference. To minimize problems, follow this instruction:

1. Turn the subwoofer on and pair it, which usually requires holding the Pair or Bluetooth button for 3 to 5 seconds until the light flashes blue.
2. On the Xiaomi soundbar, press and hold the Source (or Mode) button until you hear a beep or see a flashing Bluetooth indicator.
3. If the soundbar does not go into search mode automatically, use the remote: go to Settings → Connections → Bluetooth and select Add Device option.
4. In the list of available devices, find the name of your subwoofer (for example, JBL Sub 200P or Xiaomi Subwoofer) and confirm the pairing.

Once successfully connected, the soundbar can automatically switch to mode 2.1 or 3.1 (depending on the model), and the subwoofer will start playing low frequencies.

• 🔊 Volume level on the subwoofer (adjusted by a separate pen or buttons).
• 📶 Distance between devices (must not exceed 10 meters without obstacles).
• 🔄 Sound mode on the soundbar (in the settings, select Movie or Music to activate the subwoofer).

Make sure that the subwoofer is in pairing mode

Check the battery power (for portable models)

Update the soundbar firmware

Reboot both devices

Repeat the conjugation-->

⚠️ Attention: Some Xiaomi soundbars (e.g. Redmi Soundbar Pro) only support one active Bluetooth device at a time. If a smartphone or TV is already connected to the soundbar, the subwoofer may not connect.

3. Wired connection: RCA, 3.5 mm and optical cables

The wired connection provides a stable signal without delay, but requires compatible connectors. Most Xiaomi soundbars have at least one of the following outputs:

• 🎛️ Sub Out (RCA): The standard active subwoofer connector used in Mi Soundbar models 3.1ch mi TV Soundbar.
• 🔌 3.5 mm (AUX): Universal output, but requires an adapter to connect to the subwoofer RCA-entrance.
• 💡 Optical (TOSLINK): Digital output, but rarely used for subwoofers (usually for TV connections).

Instructions for connection through RCA:

1. Turn off the soundbar and subwoofer from the network.
2. Connect one end. RCA-cable (usually bundled with subwoofer) to the Sub Out output on the back of the soundbar.
3. Connect the other end to the Line In entrance or AUX In on the subwoofer.
4. On the subwoofer, you may need to select a signal source (e.g., Line or Line). AUX).
5. On the soundbar, go to the sound settings (Settings) → Sound → Subwoofer) and activate the External Subwoofer option.

If after connecting the subwoofer emits background noise (hisping), check the quality of the cable - cheap RCA-You can also try to swap left and right connectors (sometimes this eliminates the problem).

4. Wi-Fi Connection: for Mi Home-enabled soundbars

Some Xiaomi soundbar models (e.g. Mi) TV Soundbar or Mi Soundbar 3.1ch) It supports Wi-Fi connectivity in the Mi Home ecosystem, which provides minimal latency and stable connectivity, but requires a high level of connectivity:

• 🌐 A router with support for 2.4 GHz (5 GHz is not suitable!).
• 📱 Installed application Mi Home on the smartphone.
• 🔄 Updated firmware on soundbar and subwoofer.

Step-by-step:

1. Connect the soundbar and subwoofer to a single 2.4GHz Wi-Fi network.
2. Open the Mi Home app, go to Devices section → Add the device.
3. Select the Audio category and find your soundbar model.
4. Follow the instructions on the screen. The system will automatically detect the subwoofer if it's compatible.
5. After pairing in the device settings, activate the option to Use a subwoofer.

The advantage of this method is the ability to control the volume of the subwoofer directly from the Mi Home application or voice (if connected to Xiaomi). AI However, if your router only runs on 5 GHz, you will have to use other ways to connect.

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If the subwoofer is not detected by Wi-Fi, try resetting it. To do this, hold the Reset button (usually hidden on the back) for 10 seconds until the indicator flashes red.

5. Sound tuning: synchronization and frequency balance

Even after a successful subwoofer connection, it may not work correctly: the sound is behind the video, the bass is too loud or, conversely, barely audible, these problems are solved by settings:

🔊 Synchronization of sound (removal of delay)

Sound delay is more common when you connect to Bluetooth, to eliminate it.

• 📱 In the soundbar settings, find the Audio Sync or Lip Sync option and increase the latency value by 50-150 ms.
• 🔄 Reconnect the subwoofer, pre-reset its settings (see the instructions above).
• 🎵 Use a wired connection if the latency is critical (e.g. for gaming).

⚖️ Frequency balance

If the bass is too strong or weak:

1. On the subwoofer, adjust the volume level with a separate handle (usually signed Volume or Level).
2. In the soundbar settings (Settings) → Sound → Equalizer: Choose Movie Preset for Low Frequency Amplification or Music for Balanced Sound.
3. If the subwoofer is “bubbling” (the sound is distorted), reduce the low frequency level in the manual equalizer or move the subwoofer away from the walls.

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For perfect synchronization of sound and video, use a wired connection or Wi-Fi. Bluetooth is only suitable for music where latency is non-critical.

Typical problems and their solutions

Even when connected properly, there can be problems, and here are the most common ways to fix them:

If none of the solutions worked, try resetting the soundbar to factory settings.

1. Turn off the soundbar.
2. Press Volume+ and Source buttons at the same time.
3. Turn the device on to the network by holding the buttons for 10 seconds.
4. After resetting, reconnect the subwoofer.

⚠️ Warning: Resetting will remove all stored Bluetooth devices and custom equalizers. Write down or take a picture of your current settings in advance.

7.How to Choose a Subwoofer for Xiaomi Soundbar

If you haven’t bought a subwoofer yet, here are the criteria for maximum compatibility:

• 🔌 Type of connection: For Mi Soundbar 3.1ch — wireless (Bluetooth/Wi-Fi) exit RCA. Redmi Soundbar Pro is wireless only (no Sub Out).
• 📏 Size and power: For a room of 15-20 m2 enough subwoofer for 50-100 W. For large rooms, choose models from 150 W.
• 🎛️ Adjustments: Optimal if there is a volume handle and a low-pass filter (Crossover).
• 🔋 Power: Active subwoofers (with built-in amplifier) are easier to connect than passive subwoofers.

Recommended models:

• 💰 Budget option: Edifier T5 (Bluetooth, 80W – Suitable for Redmi Soundbar Pro.
• 🔝 The best choice: Xiaomi Mi TV Subwoofer (Wi-Fi, 100W) is ideal for Mi Soundbar 3.1ch.
• 🎯 Premium: JBL BassPro Go (Bluetooth, 200W) – for large rooms.

FAQ: Frequent questions