Bennett,
You might check on the word “overexcurse” before the article...
Spelling and word use aside, most current loudspeakers use cone mid drivers, but using 1” to 2” exit horn drivers with aluminum diaphragms to 500 HZ, with second order crossovers used to be typical for Altec, EV, JBL, and Peavey.
Shattered diaphragms, and more often, surrounds were probably more common than burnt voice coils then.
Still lots of those old systems still in use.
Titanium made shattered diaphragms more rare, even with low crossover points, though some types seem more shatter prone than others.
Over excursion still can easily happen with a cold solder joint on an inductor in a passive crossover, which can drop the crossover frequency more than an octave and go from second or third order to first order.
I hate it when that happens.
Art Welter
