Connecting soundbar to the Xiaomi Mi TV 4S

Integrating an external speaker system into a home theater based on a Xiaomi Mi TV 4S is a logical step for anyone who wants to significantly improve the quality of the audio being played. The regular speakers of modern thin panels often cannot convey the deep low frequencies and pure high tones necessary to immerse themselves in the atmosphere of a movie or game. A properly selected and customized soundbar can completely change the perception of content, making it voluminous and rich.

Connecting devices may seem complicated at first, but the Android TV interface on this model offers many flexible options for peripheral integration. There are several physical and wireless interfaces, each with their own technical advantages and limitations on audio bandwidth.

In this article, we will discuss in detail all available switching methods, from the best digital connections to convenient wireless protocols. You will learn how to activate volume control from the TV remote, how to avoid dissynchronization of image and sound, and what system settings require manual intervention for proper operation. HDMI cable marked ARC or eARC is the only way to transmit uncompressed multichannel Dolby Atmos sound in this model.

Selection of an optical connection interface

Before you start physical manipulation, you should carefully examine the back and side panels of your Xiaomi Mi TV 4S. This model is usually equipped with a set of ports including HDMI (one of which is marked as ARC), S/PDIF optical output, USB connectors and a standard 3.5 mm minijack. The choice of the specification of your acoustic system and your expectations for sound quality.

The most modern and functional option is the HDMI ARC (Audio Return Channel) interface, which allows high-quality multi-channel audio from the TV to the soundbar and simultaneously sends control signals in the opposite direction. Thanks to CEC technology, turning on the TV will automatically activate the soundbar, and the volume control will be carried out by the native control panel, which creates the effect of a single device.

If your acoustics are older or do not support HDMI, consider an optical connection. S/PDIF digital output provides pure audio transmission without interference typical of analog cables, however, it has bandwidth limitations and does not support the latest object audio formats. Bluetooth is also acceptable for budget solutions or temporary equipment placement, although this method often suffers from delays and compression of the audio stream.

• 🔌 HDMI ARC: Best choice for home theater, supports single remote control and high bit rates.
• 🔴 Optical (S/PDIF): Reliable digital connection, perfect for old soundbars without HDMI.
• 🎧 3.5mm Jack: Analog variant, suitable only for simple stereo systems, sound quality is limited.
• 📡 Bluetooth: Wireless connectivity, but audio delays and loss of quality when compressed.

Preparation of equipment and compatibility check

Before commuting, make sure all devices are off the grid. This is a basic electrical safety rule that helps prevent possible power surges that can damage sensitive port electronics. It is also recommended to check the integrity of the cables: there should be no clamps on the wires, and the connector contacts should be clean and not oxidized.

For users choosing the HDMI path, it is critical to use a cable that supports HDMI 1.4 or higher, visually such cables often have the "High Speed" label or the Ethernet logo, although simpler versions are enough to transmit sound, the main thing is the availability of audio return channel support. Cheap cables without shielding can become a source of electrical tips, manifested as background noise or crack.

If you plan to use an optical cable, remove the protective caps from the ends just before you connect.The optical fibers inside the cable are very fragile, and getting dust on the end can significantly impair the quality of the light signal passing, leading to intermittent sound or its complete disappearance. Make sure the soundbar supports the audio stream format you plan to use, for example, Dolby Digital or DTS.

⚠️ Note: Do not put excessive effort into inserting optical cable into port. S/PDIF. The connector has a specific shape, and improper force can break the plastic flag inside the TV port, making it unusable.

Instructions: Connect via HDMI ARC

This method is a priority for owners of Xiaomi Mi TV 4S, as it provides the highest sound quality and maximum comfort of use. Find a connector on the back of the TV, signed as HDMI (ARC). It usually differs in color or special labeling next to the port. Insert one end of the HDMI cable in this port and the other in the corresponding input on the soundbar, which should also be marked as HDMI OUT (TV ARC).

After the physical connection, turn on both devices. The TV should automatically identify the new peripherals. If this does not happen, go to the main menu of the system and select Settings. In the window that opens, you are interested in Sound or Settings of Sound, where you want to find the option to select the output of the audio signal. From the list of available devices, select HDMI ARC or the name of the connected soundbar.

To activate control of one remote, you need to make sure that the HDMI-CEC function is active. In Xiaomi TVs, this technology is often called Mi Remote or simply CEC. Go to Settings → General → HDMI Login and make sure that the CEC switch is in the "On" position. This will allow your remote control to adjust the soundbar volume and turn it on with the screen.

In some cases, you may need to manually adjust the output format. Go to Settings → Sound → Additional settings and find Digital Sound Format. If the soundbar supports multi-channel formats, choose Dolby Digital or Dolby Digital Plus. If you use a simple stereo, you better set the PCM value so that the TV decodes the signal and transmits the finished stream.

• 🎬 Connect the cable. HDMI port-marked ARC on TV and soundbar.
• ⚙️ In the audio settings menu, select the output HDMI ARC instead of built-in speakers.
• 🔘 Activate the function CEC volume control from one remote.
• 🔊 Choose the Dolby Digital sound format or PCM depending on acoustic capabilities.

Use of optical output S/PDIF

Optical connectivity remains the gold standard for reliability for mid-to-high-end audio systems. To implement this, you'll need a Toslink cable. One end of the cable is inserted into the SPDIF (or Optical Out) port on the back of the Xiaomi Mi TV 4S, and the other into the Optical In input on the soundbar. The characteristic red light glow at the depth of the connector indicates the presence of the signal.

The software part is similar to HDMI, but with important differences: In the Settings → Sound menu, you need to choose the output type Optical output or S/PDIF. After that, the TV will switch the audio stream from the internal speakers to the external port.

Special attention should be paid to synchronization. When using digital interfaces, including optics, sometimes there is a desynchronization when the sound lags behind the movement of the actors' lips. To correct this defect in the audio menu, find the Audio Delay parameter. Adjust the value in milliseconds until the articulation matches the audio sequence.

If you use a surround soundbar but connect it through optics, make sure that the Dolby Digital 5.1 output format is selected in the application settings (such as Netflix or the built-in player). Otherwise, the TV can broadcast a compressed stereo signal, and the soundbar will work in pseudo-volume mode without revealing its potential.

⚠️ Warning: Optical cable only transmits sound. Volume control from the TV remote through optics often doesn't work unless the mode is activated. CEC Or if the soundbar doesn't sync with this protocol, be prepared to use the soundbar remote to adjust the volume level.

Wireless connection via Bluetooth

Option for those who appreciate minimalism and the absence of unnecessary wires in the interior. Xiaomi Mi TV 4S is equipped with a built-in Bluetooth module that allows you to connect external acoustic systems without physical cables. To get started, go to Settings → Remotes and accessories (or Bluetooth section depending on the firmware version) and select the option Add Accessory.

Put your soundbar in pairing mode. You usually press and hold the Pairing or Bluetooth button on the device body or remote until the indicator flashes quickly. The name of your acoustics should appear on the list of available devices on the TV screen. Choose it and confirm the pairing.

Despite its convenience, Bluetooth connectivity has its technical limitations: codecs used to transmit audio through the air often compress the audio stream, which can lead to loss of detail in the sound. Also, even with modern versions of Bluetooth, there is noticeable audio delay, which makes this method less suitable for watching dynamic action movies or games where reaction is important.

Connection stability also depends on distance and interference. Make sure there are no massive metal objects between the TV and the soundbar and the distance is less than 10 meters. If the sound is interrupted, try turning off other active Bluetooth devices in the room that can create interference.

• 📶 Activate Bluetooth in the Settings menu → Remote and accessories on TV.
• 🔗 Transfer the soundbar to pairing mode and select it from the list of devices.
• ⏱️ Check for a delay of sound and if necessary use the mode "Cinema" on the soundbar.
• 🔋 Remember that wireless soundbars run on the network, but can drain the remote’s battery faster.

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To minimize the latency of the Bluetooth connection, some soundbars have a special "Game" or "Movie" mode that prioritizes data rate over coding quality. Check the instructions for your acoustics.

Customization of sound parameters and troubleshooting

Once you've successfully connected, it's important to set up your audio profile correctly. From the Xiaomi Mi TV 4S menu, go to Settings → Sound → Sound Mode. For movies, the best choice is Movie Mode or Dolby Audio, which expands the stereo and enhances dialogue. For watching news or sports programs, Standard or News mode, where the emphasis is on medium frequencies, is better.

A common problem is that you don't automatically switch when you turn on the soundbar. If the TV continues to play through the built-in speakers, check the CEC settings again. Some versions of MIUI TV firmware require you to manually select "External speakers" in the quick menu called by the audio settings button on the remote.

If there is a sound but it is silent or distorted, check the balance and equalizer settings. Reset all user audio settings to factory values to prevent software failure. Also make sure that the apps (YouTube, Movie Search, Netflix) do not have a different output device than the system in their own settings.

The table below shows the main parameters and their recommended values for different use cases:

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The key to stable work is choosing the right digital audio format (PCM or Bitstream) depending on the connected interface and soundbar capabilities, and a mistake in this area often leads to no sound or hissing.