Gammajo,
I felt my idea was getting rained on, so I was going to drop outta here.
As far as this safety issue : There are many tube amps that run "wide open" no chassis top, bottom or sides to speak of, with big hot driver tubes staring at your face, my VAC monos are an example, what's safe ?
Sherod, that's a great place, I've talked to Jeff G. many times, he knows speakers and crosssover designs like nobodys business.
Another material I have four sheets of, is called No Rez from GR Research, the other speaker genius Danny R.
I'm gonna put my lid on and shut off, good luck guys >>>>