Duke mentions vintage Klipsch, and I can back that up. I had a pair of Klipshorns for almost 25 years. I pulled the woofers out (they are enclosed inside the cabinet) for inspection prior to selling them and much to my surprise, they looked brand new!
Zu Definition (according to their website) has a life expectancy of 100 years on the cabinet and drivers- even in sunlight.
Zu Definition (according to their website) has a life expectancy of 100 years on the cabinet and drivers- even in sunlight.