So I take it that the # of channels wrt speakers is proportional to the # of speakers, while the # of channels (2.1 vs 5.1) with respect to the sound card refers to the # of speakers it supports surround sound wise?..
I am a 2.1 speaker system. For this, is a SB Live! 24-bit sufficient?.. Any point in upgrading to an Audigy or an Audigy 2??..