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Good advise as to shear acoustic power. I wouldn't put the L150 behind any CW, though, except as to sensitivity and a proud-to-be-loud attitude.

I second your comments on Xmax and excursion. Not...

Hmmm, I think you really need to look closer at parking that (or those) old amplifiers until you have ruled them out as the problem. Or the preamp, for that matter.

"Purplish" for color on the...

Hold on. The idea was to borrow one, not buy one. It must be frustratingbut you don't want to go way off in different directions and spending bucks trying to figurethis out.

If everything is...

The pair of 128H-1 drivers I had did have aquaplas on the front. I do not recall what the back of the cone looked like. Mine are not these below, but as shown with the application of aquaplas.
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Just for context's sake, Derek, it would a breach of his JBL service contract to sell the replacement kit without also installing the kit. So, not so much he won't, but can't.

Well, par for the course for newbies. Plenty of similar stories abound in this forum. Including mine when I got a pair of 128H woofers with old and tired spiders as my first entre into vintage JBL....