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be wrote:

Romy wrote: "However, the diaphragm in the small JBL 2420 driver is full metal (correct me if I am wrong) and there is absolutely nothing in that driver that might be soften mechanically." The speach coil former seems to be made of some kind of fiber and capton, the speach coil wires are fixed by glue and the insulation on them must be a polymer. I think these must be as strongly influenced by temperature as a plastic suspension.

Be,

I thought about it but I do not think that it is the reason. There are two motives:

1)    VC glue is usually epoxy-base and for epoxy 30-40 degree difference is not a difference at all.

2)     If the glue got soften and begin to damp the compliance between the turns of VC and the former then everyone would note that driver would stop to react or became less sensitive to the low level signals. I mean the very minimum currents would be consumed by elasticity of the glue and would not acknowledge by diaphragms. You do not see the field-coil peoples report it. In fact they look like report opposite. I do not have a lot of credibility in their reports as most of what they esteemed sounded very mediocre in my view but I do NOT think that electromagnets do it details.

So, I do not think that the temporary “liquefying of glue” would be the case, but who knows…

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