黄金是很贵,但是镀金的工艺更贵。因为喷涂上去的金就是几个原子层厚,那重量是忽略不计的。镀金很大程度上的原因是黄金的延展性好, 镀上去以后可以跟随振膜的大振幅。但是久了以后也会起皱。“Another issue is that gold-coated diaphragms can wrinkle over time due to the unevenly matched expansion coefficients of gold and mylar, whereas the SE Electronics designers expect titanium to give better longevity in this respect.”所以人家用镀钛来得到更长的寿命。http://www.soundonsound.com/sos/nov05/articles/setitan.htm