Wayne,
My horns on top of the 2226 in the JBL 3677 cabinet are portable(sitting on top), and the crossover is designed for quick change-out.
I will do some more listening and swap between the Martinelli 650hz tractix and the Edgar 650hz round tractix. I was going to be doing a listening test between my JBL 2426 and my Altec 902 to see the "aluminum vs titanium" sound differences.
Bill E. will be visiting me Saturday, so I am lucky to get a unbiased extra set of ears for the testing.
Ron