Hey guys,
I just got a pair of Aquaplas 2450SL (made in Mexico) diaphragms from Speaker Exchange, to try on my 2451h. The note for the diaphragms says "non-centering" and must be installed by a specialist, whatever. Okay. Can I do this myself?
I can install carefully, run a sweep. What am I testing for? Suggestions? Is this note to be taken seriously? Has anyone here done this?

thanks,
Herman