5.1 / 2.1 / 7.1 ETC is the amount of speakers
e.g. 2.1 is 2 speakers with a sub woofer...
7.1 is 7 speakers with a sub woofer... etc...
for about £50 you can get a good set of 2.1 speakers, or a fairly cheap set of 5.1 or a really cheap set of 7.1 ... lol...
2.1: http://www.ebuyer.com/product/105873
5.1: http://www.ebuyer.com/product/120414
7.1: http://www.ebuyer.com/product/97518
they are just examples. just to give an idea...
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