I'm planning on getting the Logitech Z-5500 speakers just for use with my latest-generation mac pro. I'm a bit concerned, however, as I do not want to have to buy a new sound card to use 5.1; so I was thinking I will just use the integrated optical audio out. On the logitech website it states that the speakers support digital optical input. Can I just buy a cable like this (TOSLINK M-M), plug one end into my Mac, and the other into the subwoofer? Then hook up the satellites to the sub using the (what appear to be based on pictures) attached coax cables? Basically what I need to know is if I need any extra hardware to make this work, and if I do, what hardware that would be (I saw a few posts on here about this, but nothing specific to what I need to know). I was reading on a few other places that I need some optical->coax thing. Would this mean it would be optical from my mac to the converter->coax to the sub->coax to the speakers? Is it possible to do just optical from mac to sub->coax to speakers?