If you're going to use the analogy, please spell it right. Sit on your porch(e), own and drive a Porsche (two syllable please).
This really is the best way to go from a time and expense standpoint. The Factory service shop can, at your request at time of installation, run a frequency response test and listening test, and they'll pretty much know whether the diaphragm is good. If it isn't, and most of them will know right away if they have any experience with the 2405, then they can contact JBL for another diaphragm without you having to lose the time of picking it up and then returning it again. Plus if the unit fails under warranty, then you still have the backing of JBL for the warranty.
I know the issue of cost is sometimes difficult, but when you are paying for JBL engineering and production, you usually get the right results. So far, no aftermarket 2405/2402 diaphragm has even come close, mostly because the aftermarket producers are only interested in profit, not performance, and its not their name or reputation on the line with these parts (you can't even figure out who the real supplier is, at least that could give us some way of choosing a better aftermarket supplier). IF it was so easy to make such a small thing, you'd think they would have figured it out by now. There MAY be someone eventually who could consistently build a comparably good diaphragm to JBL, but I bet it won't be inexpensive either.
My 0.02.
Bart
When faced with another JBL find, Good mech986 says , JBL Fan mech986 says
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