I am curious whether the stereo miniplug is sufficient for the Klipsch promedia 5.1 speakers I already own. The speakers have three inputs, one for sub/center, one for front, and one for back. However, there is an additional input for an mp3 player or whatever. My question is whether that input will be enough to get all the speakers to work. I don't really care about having true 5.1 sound, although it would be nice. I haven't been able to find any third-party 5.1 soundcards for powerbooks.