How to connect external audio using an optical cable

Last Update date : Sep 07. 2020

There are several ways to connect external audio to your TV. One of the popular ways is to use an optical cable that can send high-quality audio. If you choose this way to set up your audio system, read more below. We have an article on how to connect an optical cable.

What is an optical cable?

An optical cable is a physical connection that transfers audio digital signals by light. Looking at the transmission process, light passes through the optical cable, and the light pulse is converted into electrical pulses containing audio information. The electrical pulse is then converted to an analog signal through a compatible destination device and amplified so that we can hear it.


The advantages of the optical cable are that the transmission loss is lower than metal cables, which is good for long-distance transmission and it can be used semi-permanently.

Note: The methods provided below are the most common. For model-specific information about other possible connections and system settings, refer to the operating instructions supplied with your products. 

Connect with an optical cable

Step 1. Insert the digital optical audio cable into the DIGITAL AUDIO OUT port of the TV.

Connect Optical Cable to TV

Step 2. Insert the other end of the digital optical cable into the DIGITAL AUDIO IN port of your external speaker.

Connect Optical Cable to Audio Device

Step 3. Press the Home button on the remote control and select Settings.

Home Settings Menu

Step 4. Navigate and select Sound Output in the Sound menu.

Sound Ouput

Step 5. Select Audio Out/Optical.

Select Audio Output Optical

Difference with HDMI

Both an optical cable and HDMI are connection methods that provide good sound for you. However, you may be curious about the differences between them.


First and foremost, there is no difference in sound. Whichever type you choose, they both send the same sound. Both can send multi-channel audio that is better than analog.


The main difference between an optical cable and HDMI is the number of audio formats supported. The optical cable supports 5.1 Dolby Digital and DTS audio. HDMI supports not only 5.1 Dolby Digital and DTS audio but also Dolby Digital Plus, Dolby True HD, DTS-HD Master Audio, Dolby Atmos, and DTS:X.

Note: The device screenshots and menu are only sample in English - they are also available in the language of your country.

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