Scott would like to replace his thirty year old speakers for his home theater system. Scott says that it's not uncommon for the "surround" foam to deteriorate and cause the speaker diaphragm to vibrate more than it should. Refoaming a speaker isn't easy, or cheap. Ross says that there are kits out there on the internet, or there are companies that can do it, but it's probably time to get new speakers.
In the chatroom, Beatmaster says that if the speakers are high quality, it may be cheaper and worth replacing it. It really is a question of personal preference. Scott says that there may be a point to be made that since older speakers tend to have a "warmer" sound that many people like it better, and new speakers can't duplicate it.