You bought a powerful one home cinema or a soundbar, but the sound from the TV is still coming through the built-in speakers? The problem is familiar to many: even premium models Samsung QLED or LG OLED cannot compare in sound to a full-fledged speaker system. However, simply connecting the speakers to the TV is half the battle. You need to correctly configure the sound output, choose the optimal interface and avoid common mistakes that can cause the sound to disappear or become distorted.

In this article we will look at all current methods of sound transmission - from the classic HDMI ARC/eARC to wireless protocols like WiSA, and also explain why it is sometimes better to use optical cable, not Bluetooth. You will learn how to synchronize sound with picture, what settings need to be changed in the TV menu, and what to do if the system does not recognize the connected audio device. For convenience, we have compiled comparison table of all methods with pros and cons, and at the end we will answer frequently asked questions about setup.

1. HDMI ARC/eARC: the best choice for modern systems

If your TV and home theater support HDMI ARC (Audio Return Channel) or its improved version eARC, this is the best connection option. The technology allows you to transmit multi-channel audio (including Dolby Atmos And DTS:X) without loss of quality through one cable that simultaneously transmits both video and audio.

To enable ARC/eARC:

  • 🔌 Connect your TV and receiver/soundbar High speed HDMI cable (version 2.0 or 2.1) to ports marked ARC or eARC.
  • 📺 In the TV menu, find the section Sound → HDMI Output (on Sony Bravia this is Settings → Display and sound → Audio output → Digital audio output).
  • 🔊 Select mode ARC or eARC and enable the option HDMI Control (CEC) for synchronizing remote controls.
  • 🎛️ On the receiver (for example, Denon AVR-X3800H) activate HDMI Control and select the appropriate input.

The main advantage of eARC over ARC is support uncompressed audio formats (For example, Dolby TrueHD), which is critical for 4K Blu-ray. However, this requires a cable Ultra High Speed HDMI (48 Gbps certified).

📊 What kind of TV do you have?
  • Samsung (QLED/Neo QLED)
  • LG (OLED/NanoCell)
  • Sony (Bravia XR)
  • Xiaomi/Redmi
  • Other brand
⚠️ Attention: If after connection the sound comes with a delay (lip sync), check the settings Audio delay in the TV menu. On LG CX/C1 it's in All Settings → Sound → Audio Sync. The optimal value is from -50ms to +100 ms.

Optical interface S/PDIF (or TOSLINK) is the second most popular method of transmitting sound. It is suitable for systems where HDMI ARC is not available, or when you need to connect an older receiver. The main plus is immunity to electromagnetic interference, which is important in conditions of dense cable distribution.

How to connect:

  1. Connect port Optical Out on a TV with input Optical In on the receiver/soundbar.
  2. In the TV menu (Sound → Digital Audio Output) select PCM or Bitstream (for transmitting compressed formats like Dolby Digital).
  3. On the audio system, activate the appropriate optical input.

Optical connection limitations:

  • 🚫 Does not support Dolby Atmos, DTS:X and uncompressed formats (maximum - Dolby Digital Plus 5.1).
  • 🔌 The cable is fragile - avoid sharp bends (radius of at least 5 cm).
  • 📶 The maximum cable length is 10 meters (with a longer length, signal loss is possible).

Are the Optical Out (TV) and Optical In (receiver) ports connected?

Is Bitstream mode selected in TV audio settings?

Is the optical signal indicator on the receiver lit?

Has the cable been checked for physical damage?-->

For owners Samsung Q-series or LG GX The optical output can be useful as a backup option if HDMI ARC suddenly stops working after a firmware update (this problem occurred in 2023 firmware).

3. Bluetooth and Wi-Fi: wireless solutions

Wireless technologies are convenient if you don't want to run cables or your speaker system (eg. Sonos Beam or Bose Smart Soundbar 900) only supports wireless protocols. However, there are nuances here:

Bluetooth (version 5.0 and higher) is suitable for soundbars, but has limitations:

  • 🎵 Maximum quality - AAC or aptX (no support Dolby Digital).
  • 🕒 Sound delay (~100–200 ms), which is critical for films.
  • 🔋 Battery consumption on portable devices (relevant for sound panels with a battery).

To connect your TV via Bluetooth:

  1. Activate Bluetooth on the soundbar (usually with the Pair or via the app).
  2. On TV go to Settings → Sound → Bluetooth Output (on Android TV it could be in Devices → Add Bluetooth device).
  3. Select your soundbar from the list and confirm pairing.

Wi-Fi (via AirPlay 2, Google Cast or WiSA) is free of Bluetooth delays, but requires:

  • 📶 Stable 5 GHz network (2.4 GHz may cause lags).
  • 🔄 Protocol compatibility (e.g. Apple TV 4K works with AirPlay 2, and Nvidia Shield — with Google Cast).
  • 🛠️ Traffic priority settings on the router (QoS for audio streams).
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If the sound via Bluetooth is interrupted, reduce the distance between the TV and the soundbar to 3 meters and remove obstacles (walls, metal objects).

4. Analog connections: RCA and 3.5mm

Although analog interfaces are outdated, they are still relevant for budget systems or vintage equipment. Let's consider two options:

RCA ("tulips") transmits stereo sound (left/right channels) through two connectors. Suitable for connecting to old receivers or active speakers. Cons:

  • 🎛️ Sensitivity to interference (background noise may appear).
  • 🔊 Limited frequency band (maximum 20 kHz).
  • 🛠️ Requires manual adjustment of channel balance.

3.5 mm (mini-jack) Convenient for connecting to portable speakers or soundbars with an AUX input. For example, this is how you can connect a TV to JBL Bar 2.1 or Yamaha YAS-109. However:

  • 🚫 No support for multi-channel audio (stereo only).
  • 🔌 The cable must be shielded (otherwise there will be interference).

For analog connection:

  1. Connect port Audio Out (3.5 mm or RCA) on TV with a corresponding input on the audio system.
  2. In the TV menu (Sound → Audio Out) select Analog or Variable Audio Out.
  3. Adjust the volume on both devices (on some TVs, for example TCL 6-series, the analog output has a fixed signal level).
⚠️ Attention: When using a 3.5 mm cable longer than 5 meters, the signal may be weakened. In this case, a line level amplifier will help (for example, Behringer MICROAMP HA400).

5. Comparison of all connection methods

Method Max. sound quality Delay (lip sync) Difficulty setting up When to use
HDMI eARC Dolby Atmos, DTS:X (7.1.4) No Average Premium systems, 4K Blu-ray
HDMI ARC Dolby Digital Plus (5.1) No Low Modern TV and soundbars
Optical (TOSLINK) Dolby Digital (5.1) No Low Backup connection, old receivers
Bluetooth AAC/aptX (stereo) 100–200 ms Low Portable speakers, temporary solution
Wi-Fi (WiSA/AirPlay) 24-bit/96 kHz (multi-channel) <50 ms High Wireless systems (Sonos, Bose)

From the table it is clear that eARC is the best choice for home theater if your devices support it. The optical cable is suitable as a backup option, and Bluetooth should only be used for music, but not for movies due to latency.

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For gaming on PS5/Xbox Series X, be sure to use HDMI eARC - it's the only one that supports low audio latency (ALLM) and 3D audio formats.

6. Solving common problems

Even after proper connection, problems may occur. Here are the most common ones and how to fix them:

No sound via HDMI ARC/eARC:

  • 🔄 Restart the TV and receiver (unplug for 1 minute).
  • 🔧 Check if it is turned on HDMI-CEC (on Samsung this is Anynet+, on LG — Simplink).
  • 📋 Update the TV and audio system firmware (on Sony STR-DN1080 bugs with eARC were fixed in version 2.045).

The sound is interrupted or distorted:

  • 🔌 Replace the HDMI cable with a certified one Ultra High Speed (For example, Belkin UltraHD).
  • 📶 For Wi-Fi sound, switch your router to a 5 GHz channel with a width of 80 MHz.
  • 🛠️ Disable sound processing on TV (Settings → Sound → Effects → Off).

Lipsync (mismatch between audio and video):

  • 🎛️ Manually adjust the delay in the TV menu (on Philips Android TV this is Settings → Display and Sound → A/V Sync).
  • 🔄 If you use external devices (for example, Apple TV), update their firmware.
  • 📺 For soundbars Samsung HW-Q990C activate the mode Game Pro to minimize latency.
What to do if the TV does not see the soundbar via Bluetooth?

1. Make sure the soundbar is in pairing mode (the indicator light is flashing blue).

2. On TV, remove all previously paired devices (Settings → Bluetooth → Delete all).

3. Reboot both devices.

4. If used Android TV, reset network settings (Settings → Network and Internet → Reset Wi-Fi/Bluetooth).

5. For models Xiaomi Mi TV You may need to roll back the firmware (a bug with Bluetooth in MIUI TV 3.0).

7. Additional settings for perfect sound

Proper connection is only half the battle. To make the sound really play, configure:

Audio formats:

  • 🎬 In the TV menu, select Bitstream (not PCM) to transfer original tracks (for example, Dolby TrueHD from Blu-ray).
  • 🔊 On the receiver, activate spatial audio processing (Dolby Surround or DTS Neural:X for stereo upscaling to 5.1).

Equalizer and calibration:

  • 📊 Use built-in microphone calibration (available on Denon, Marantz, Onkyo).
  • 🎧 For soundbars without calibration (e.g. TCL Alto 8i) Manually reduce the bass if the bass booms.

Volume control:

  • 🔊 Turn it on Volume Sync (on Samsung this is HDMI Volume Control) to control the sound with one remote control.
  • 📵 Disable audio processing on TV (Settings → Sound → Effects → Flat) so that equalizer settings are not duplicated.

For owners LG C2/OLED And Sony A80J useful to activate the mode Cinema in the sound settings - it turns off unnecessary processing and transmits a clean signal to the receiver.

8. Frequently asked questions (FAQ)

Is it possible to connect a home theater to a TV without HDMI ARC?

Yes, alternatives:

  • 🔌 Optical cable — for multi-channel sound (up to 5.1).
  • 📶 Bluetooth - for stereo sound (but there will be a delay).
  • 🎵 Analog output (RCA/3.5 mm) - if the receiver does not have digital inputs.

For Dolby Atmos without eARC you will have to connect sources (for example, Blu-ray player) directly to the receiver, not to the TV.

Why does sound only come through the TV and not through the soundbar?

Check:

  1. In the TV menu, is the correct audio output selected (HDMI ARC/Optical).
  2. Is the corresponding input on the soundbar activated (press the Source or Input).
  3. Is the sound on TV turned off in the settings (Sound → TV Speaker Out → Off).

On Samsung QN90B And LG G2 Sometimes resetting the sound settings to factory settings helps.

How to synchronize the TV and receiver remotes?

Activate HDMI-CEC on both devices:

  • On Sony — BRAVIA Sync.
  • On LG — Simplink.
  • On Samsung — Anynet+.
  • On receivers Denon/Marantz — HDMI Control.

After activation, the TV remote control should control the volume and turn on/off the audio system.

What HDMI cable is needed for eARC?

Requirements:

  • 🔖 Certification Ultra High Speed HDMI (logo on packaging).
  • 📏 Length up to 3 meters (for longer lengths you need an active cable or amplifier).
  • 🔍 Verified models: Belkin UltraHD, AudioQuest Carbon, Monoprice Certified.

Cables High Speed HDMI (up to 18 Gbit/s) not suitable for eARC!

Can Dolby Atmos be transmitted through optics?

No, optical cable supports maximum Dolby Digital Plus 5.1. For Atmos needed:

  • 🔌 HDMI eARC (for streaming services like Netflix or Disney+).
  • 💿 Direct connection Blu-ray player to the receiver (via HDMI).

The exception is soundbars with virtual Atmos (For example, Samsung HW-Q990C), which can emulate surround sound from a stereo signal.