I think that's something you can do, but I haven't a clue how. I know my parents have paid a fair amount of money to have it done on their speakers.
Its a relatively simple procedure, You basically just remove the old surround and glue the new one on. Although you may or may not have to cut off the dust cap and shim the voice coil in the gap otherwise it can become off center and rub. The last time I put new surrounds on a pair of drivers I did not have to do that. Parts express sells refoam kits. They can also help you select a new driver that would work well in your speakers if you did not want to refoam them.
