KEF 104/2, 107's and 107/2's all use woofers with foam surrounds that can and do rot with time. Different climates will affect the rate at which this happens. They can be replaced with original equipment parts from KEF or refoamned from any number of repair houses. There is unique inner foam ring on these speakers that is difficult to replace. Have not been able to get the definitive answer whether this is really necessary or just a cosmetic thing.
