Surround sound has come a long way over the last decade. Unless you were born in the last decade, you will probably remember a lot of different surround sound formats. The first format that was well known was Dolby Surround. This was then replaced by Dolby 5.1 which subsequently was replaced by Dolby Digital. These formats are using 4, 5 or 6 speakers. One of these speakers is a low-frequency subwoofer. <br /><br />During the last few years, new formats have emerged that support an even larger number of speakers. The new 6.1 and 7.1 formats support up to 8