My brother has a pair of Polk MOnitor 7s that were new in 1977 or '78. The rubber surrounds on the mid-woofer and PR are going. I know that foam surrounds can be replaced, but what about the rubber on these things. I would imagine that replacing the drivers/PRs might be just as expensive as buying new speakers. My brother is not an audiophile. He inheirited the Polks from my mother.