Before I replaced my sub driver.....twice, once to a 10" and then to a 12,...I ran the sub with its' original 10" full-range "speaker".....
(my youngest Grandkid finally did it in when she gave the vol control a spin...blew out a chunk of cone about 2" X 1/4")
....but the driver sounded pretty darned good until then; no rattles, surround tears or any other indications of distress, not too bad considering its' 1946 vintage
After the failure, I do have to admit that the paper cone did "feel" to be maybe a bit brittle
