Anyone know the difference between the Turtle Beach Ear force DSS2 and DSS1? Are they both capable of replicating 7.1 or just 5.1 surround sound channels? They are both compatible with Mac OS X, correct? Anything else I should know? I am only asking because the DSS is going for about $40 cheaper than the DSS2. Thanks for the input and sorry if I posted this in the wrong forum!