Digital audio cable is a term that comes up when setting up home theatres and connecting sound systems. Among these cables, the digital optical audio cable is known for its ability to deliver crisp and interference-free sound using light. But what is this cable, and is it better than other options like HDMI and coaxial cables?
In this blog, we will discuss the way these cables work and their benefits. We will also tell you when to use them. We will also compare them with other types of audio cables.
A digital optical audio cable, also called a Toslink digital optical cable,was developed by Toshiba in the 1980s. It transfers sound using light instead of electrical signals. They are not like traditional copper wires. These cables use fibre optics to move digital audio between devices like Soundbars and older stereo systems.
The fibre optic cables are not affected by electrical interference. This makes them best for delivering clear and quality sound in setups with multiple devices close together. You might have seen the optical port on the back of your devices. It usually looks like a small square with a flap. It is sometimes glowing red when in use. That red glow is the light source that carries the sound signal through the cable.
Inside the cable is a core made of glass or plastic. A light signal (usually from an LED) travels through the core by bouncing off the cladding. It stays inside the cable until it reaches the receiving device. The light is then converted back into sound at the other end.
So, rather than sending an electrical signal, which is prone to interference, optical cables use light to move data. This makes the connection more precise over longer distances and more stable, too.
Connecting older equipment: Many older AV receivers and soundbars don’t support HDMI. But they do have an optical input.
Reducing cable clutter: Sometimes, using an optical cable instead of multiple analogue cables simplifies your setup.
Dedicated audio setups: Want to play music through your soundbar without turning on your TV? A digital audio cable can connect your player directly.
So, if your gear has optical ports, consider this option for clean and better sound.
Both are digital cables, but they use different methods. Optical uses light, immune to interference is great for long distances. Coaxial, in contrast, uses electrical signals. It may be more prone to interference, but it supports higher bandwidth. Optical vs coaxial digital audio cable really comes down to what your devices support and your setup needs. If interference is an issue, optical is better.
Analogue (like AUX cables) sends continuous waveforms. Some people prefer the “warm” sound of analogue. But optical is digital. It gives a clearer and more precise sound. AUX cables are also more common in phones and cars. But they are prone to interference in complex setups.
HDMI is now standard in many homes. It carries both audio and video, which makes it convenient. HDMI doesn’t always work perfectly. In some cases, a Toslink digital optical cable may give a more stable audio connection. This is mainly when HDMI ARC (Audio Return Channel) is not available or functioning. HDMI supports more advanced sound formats like Dolby Atmos. But for basic surround sound, optical is still a good choice.
If you’re ready to buy a digital optical audio cable, here are some facts that you need to keep in mind. For example;
Most Toslink cables support the same formats. So, you are mostly choosing based on build quality and length.
If you need to extend your cable, se a female-to-female Toslink adaptor. It is easier than splicing, which requires special tools. Also, make sure your devices have Toslink ports. Some newer models skip them in favour of HDMI. But if both ends support optical, the setup is simple. Plug in the cable and select optical output/input in your device settings.
So, what is a digital optical cable? It’s a fibre optic cable that sends sound using light. It gives interference-free audio. Newer cables like HDMI have taken centre stage. But optical cables still hold their ground in many audio setups.
A digital audio cable like Toslink can make a difference in sound quality in many setups. They are reliable and easy to use. They are still very much relevant.
For more on these aspects, check AF Audio.
No. They only carry digital audio. Use HDMI if you need both.
Most support the same formats. But build quality and durability can differ. Check for features like braided jackets and gold-plated connectors.
It can be up to 10–30 metres. Beyond that, signal loss may occur.
Yes. If both have Toslink ports. It is a good choice if HDMI ARC doesn’t work.
Yes. Always remove the protective caps from each end before connecting the cable.
