I'm building a prototype box for a friend of mine using brand new old stock JBL G135 woofer with a Radian HF driver with bi-radial horn.
He has a lot of old JBL inventory he purchased years ago that been sitting in his warehouse. The G135 was in an unopened box and even though it looks perfect it is distorting really badly. It sounds like its blown. The test signal was checked on a different speaker and was fine to rule that out.
Currently the box is being biamped until an appropriate crosserover can be obtained. My question is will age deteriorate a speaker that has been sitting in a shelf for a couple of decades?
I have three more unopened G135s that I will swap out and test.