5.1 Surround Sound system was standardised and named for film in 1987, it is standard format for multichannel sound in the mass market today. The 5 stands for the 5 speakers/channels placed left, centre, right, left surround and right surround. The 0.1 speaker/channel is for Low-frequency Enhancement also known as a Subwoofer, this speaker is for low frequencies only with a greater headroom of 10dB than the other five speakers/channels.
http://en.wikipedia.org/wiki/File:5-1-surround-sound.svg
accessed 10/04/13
The LFE channel or subwoofer is often placed to the left or right of the centre channel; placement of the LFE/sub is not as important as the other 5 main channel because it is dedicated to only low-end frequencies which diffract more freely than higher frequencies.
References:
Holman Tomlinson, 2008,
Surround Sound Up and Running,
Second Edition
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