Bose 301 modifications

Okay, dont laugh too hard........I'm new to the forums and have a question to pose for the experts.  I find myself in possession of two pairs of Bose 301's.  Yes, I'd like to put gasoline on them and strike match BUT....I like to experiment with things too.  Does anybody have any ideas (other than my previous one) on how to improve the sound ie swapping out the speakers inside the enclosure.  My 14 year old daughter wants me to install a stereo in her room and I thought that since I have the 301's I might be able to soup them up a little.