Channel Configurations
10.2 surround sound would add four more channels to the front listening area and only one surround channel. This is because human spatial perception of sound is much more precise in the front than in the back. In addition it adds depth to the sound field with two of the front channels being height channels, located above the listening area at 45 degrees relative to the listener. Lack of vertical information has long been considered one of the largest obstacles to truly realistic sound reproduction. Existing systems such as Dolby Pro Logic IIz and DSP systems simulate this with matrixed height channels, which are derived from ambient sounds from the left and right channels.
The ".2" in 10.2 refers to the fact that an additional Low Frequency Effects channel is added, not just a second subwoofer, to enhance the sense of envelopment. All bass from the left channels are directed to a left LFE channel while right channel bass is directed to the right LFE channel.
Read more about this topic: 10.2 Surround Sound
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