Hello, I'm new to the site and am looking at a pair of original CLS. The owner is stating the the diaphragms were replaced about 7 years ago and that Acoustat power supplies replaced the factory ones. He stated the Acoustat power supplies are considered to be more robust. I will be auditioning them next week but am curious what the brain trust here thinks they're worth. Also, is the Acoustat power supply replacement considered a good replacement?