Dolby Digital 

Background and compression

In 1992, this audio format was first introduced for movie theaters, before the private market also benefited from it a few years later with the first compatible devices. Technically, a total of six channels are mixed and matched.

Beside a central speaker placed in the front, the configuration consists of two speakers in the back and a pair of speakers on both sides. In addition, there is a woofer that is responsible for the lower frequency band and provides the necessary sound pressure. The compression takes place in the so-called AC-3 codec. Therefore, this format has a so-called lossy sound.

Compatibility and alternatives

Today, Dolby Digital is compatible with a wide range of audio devices and is widely used in film and television as well as on storage media such as DVDs and Blu-rays. Due to the multi-channel approach, a full-fledged home theater system or soundbar system with satellite speakers is a prerequisite for native playback and the best sound result. Alternatively, other formats like DTS Virtual:X or Virtual Dolby Atmos are available, which only simulate the surround sound effect, but can be used at a much lower price.