Hey, I just got the 27" Imac and had a query before buying a particular set of speakers. I want to buy the Edifier s330d 2.1 speakers. One of the S330D's features is that they have can use S/PDIF signals from either coaxial or optical TOSLINK cables. So does the imac support the optical out directly from the port for headphones or is there any adapter/cables to be used. Any info. on this is appreciated. Thanks.