"I cannot imagine owning a speaker that could be so easily blown. In my hands it would not last 5 minutes. There is no excuse for a speaker to be so fragile. The materials exist today that can be used to make a totally bullet proof ESL panel. They existed back in 1978! Jim Strickland made a bullet proof panel back then. I can rap the diaphragms against the stators without any damage. The transformers are the elements that are potentially fragile particularly with amps that are clipping. I have blown amps and transformers but never the speaker itself"
No, in your hands they probably would not last 5 minutes, but you would really have to try hard to beat the protection circuits. My two pairs of Quads have lasted about 20 years each before needing repair, which is much better than my bullet-proof Krell amplifier.
Yes, you can rap the mylar against the stators, but be aware that when powered, and for some time after switching off, the mylar carries 5.25-kV. The stators carry no voltage until a signal is applied, but then can be fatal. I always keep one hand in a pocket when near the high tension bits!
Unfortunately there is no Aussie distributor for Sound Labs.