Mah - I've ran across those pics before, very interesting. Add-on tweeters were kinda mandatory when the mid-hi drivers like the 722 ran out of steam at 6k.


Marty-
I'm not familiar with the 1285 or really any of the original Altec crossovers, but I've seen one Altec design with a 2uf across a 10R series attenuating resistor. That helps equalize HF output as you describe, but I assumed that was just to fix the 806's weak highs.