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Actually, there are 3 of them on the 12" PowerBook. Two are located in the same place as the iBook's are, and another is located underneath the keyboard. According to Apple, just having two speakers sounded terrible, so they placed a third underneath the keyboard and the sound was greatly improved.
 
I want a 12" powerbook. it'd be cool just to have one.
but then that means i gotta save up money and thats never gonna happen..maybe when i get into university i'll get the 15" one.
 
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