Maybe it would be a good idea for someone with JBL connections to call the factory and alert them to this Sub 1500 problem. If JBL knows exactly what the problem is, maybe they should alert their service centers and offer a "re-call" to re-glue these spiders before damage is done to the coils.
I feel JBL would be wise to step in and take care of this if this is a wide-spread problem. JBL should value their loyal JBL users. This is an opportunity for JBL to gain statue in the marketplace!
Tom