I am not aware of any article that Axiom has produced on speaker testing before it leaves the factory but many times on the forum Axiom staff has mentioned each speaker is checked for operation before leaving the factory.
I don't imagine it is an overly exhaustive test, most likely simply hooked up, checked for sound/clarity from each driver and then sent on its way to the consumer.
The extensive testing is done long before the speaker is sold to the consumer with each new version/design change.
Actually i did mention this many years back on my first trip to the Axiom Factory including taking a picture of a test chamber on the factory floor.
See thread here:
http://www.axiomaudio.com/boards/ubbthreads.php/topics/34543/The_AXIOM_TOUR_2004
