M-Audio Revolution 7.1 PC Surround Sound Card

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... As you can see, the two PC cards come in very close on all specifications. The figures are so close that it would be impossible for the human ear to notice. The Revo card pulls away in # of channels however. Is this important? Well, currently there are no movies to my knowledge that support a 7.1 standard, but the revo card allows you to 'generate' a signal by combining signals from adjacent channels.