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4.0 - A typical 4.0-channel system uses two speakers in the front and two in the rear or side to reproduce surround sound.3.1 - as above, but with a dedicated bass speaker (subwoofer).This can help in reproducing movie dialog and commentary clearly. 3.0 - this is similar to a stereo system, but it adds a dedicated center speaker between the front left and right speakers.2.1 - this represents a standard stereo system, but it adds a dedicated speaker for low bass reproduction (a woofer or subwoofer).2.0 - this is a standard "stereo system" - it has two speakers to reproduce a stereo soundfield.1.0 - this is a monophonic sound system with just one speaker reproducing all of the sound.If a system does not have any dedicated height channels, then the last digit is left off. " z" is the number of overhead channels or speakers." y" is the number of channels or speakers dedicated to low bass reproduction." x" is the number of channels or speakers at or near ear level,.This series of 3 numbers can be used to describe the number and type of channels in any sound system, from a simple soundbar to an advanced A/V receiver to a professional movie theater surround sound system. And those are the numbers you're asking about. As these technologies have advanced, a common shorthand has arisen in order to identify the different options available to consumers. The most recent advance in surround sound - "immersive sound" - reproduces sound in all directions, not just in front of and behind the listener, but above our heads too. Monophonic tube radios evolved into stereophonic HiFi systems, which in turn evolved into multi-channel surround sound systems. It's one that we've gotten often over the years.Īs the technology of audio and video reproduction advances, things have gotten more complicated. What do I need and what do these numbers really mean? And can I do the same thing with a soundbar intead of buying a receiver and lots of speakers? Some of the receivers say they're 7.2 and other say they're 5.1.4. I've been shopping for a receiver lately and want to get one that does the immersive audio stuff (Dolby Atmos, DTS:X).