For my girlfriend's birthday, I bought her some Logitech X-530 5.1 computer speakers for her Mac Book. I know that the mac book is not capable of full 5.1 sound, but I thought that I would be able to plug the speakers in to just play music. Unfortunatly, that is not the case. Instead of all the speakers going to one 3.5'' jack, they are split up into three 3.5'' cables (back, front, and center speakers). The speakers came with an adapter that has on one end, three holes to plug in the 3.5'' jacks and on the other end has two optical audio holes (probably to hook up to a videogame system). Anyways, we can only plug in one of the jacks into the macbook so at best, we only have 2 speakers playing with the sub. Is there any simple solution to fix this problem besides updating the soundcard (to expensive)? Is there any adapter that converts the two optical-audio ports to one single 3.5'' jack? If you have any suggestions let me know, I really need help here.