ibook speakers

[Linda L. Rowe]

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