I would use the 14 ohm shunt with a 30 ohm series(paralleled with .33 ufd) like the 4 pi crossover.By the way, I am getting ready to try a comparison between the JBL 2426 and the Altec 902 on the 650hz round tractix(Edgar) and the 650hz wooden tractix(Martinelli). Two different drivers and 2 different horns to mix and match and see which I like best.
By the way, I still prefer passive crossover on my JBL/Altec systems. Makes life easier.
Ron