Are they all equal? My local speaker repair guy say's he will re-surround my 14a's. He said he has the surrounds but doesn't know if they are specific for the JBL 14A's.He said the 14a is not a popular size and more then likely they are specific for the JBL. Could he be wrong and should I get them off e-bay where they state they are specific for the JBL 14a? Also should I have him do the spiders while it's all apart?