Hello, I am a yoga teacher and use my ibook for practically every part of my little business. I travel to some of my classes and have found that using my iTunes for relaxing music is much easier than lugging around a boombox and CD's. However, I don't want to blow out the built in speakers but I would like a fuller sound. Does anyone have any suggestions for portable speakers that are compatible with the G4 ibook? It does have a headset jack on it. I understand there are speakers that need power and those that don't. I'm looking for small, effective and no need of an extra power source (beyond the computer battery/computer connected to power source). Again, I would be much appreciative of any info. Peace, Linda