When I was in high school, I used to mess around a lot with speaker boxes. In fact, my friend used to make custom boxes. Although I haven’t done much with speakers lately, I will eventually get around building some in the future.
For those of you who have speakers that have degraded or gone bad, you might want to take a look at this article that shows you how to rebuild a speaker.
I think speakers are generally easy and you can surely save a lot of money by doing(building) things yourself.