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Re: the foam rings

They are there to prevent diffraction from a wave traveling across the surface and then radiating forward as a delayed signal when it reaches an edge. I've found foam to be more effective than felt for this, and apparently JBL has also.

That's a really nice find.

There was a post a few days ago about the 4311B and a lot of good info is posted there. Especially the Dennis Murphy crossover mods, although those would totally change the character of those speakers. My personal inclination would be to use them in restored condition, not modified. They are one of the all time great speakers for rock and popular music. Try some Santana.

What are you going to be using for an amp with those?

Jerry



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