Thank you Old Guy!

I know it has to be something. I have an 806-A. I tried it with 500, 800, 1200 Hz X0 (with 416-8B in a 612C cabs) using 511 and 811 horns. I too prefer the 802D (8 ohms diaphragm installed) than the 806A with an 8 ohms diaphragm by a lot!!

Next, I will try to compare the two using a 414A/614 cabs(being built) at around 900 Hz. I think I already know the answer but hey, something to do to keep my mind away from buying more Altec stuff.

FWIW, I found the 802D(8 ohms diaphragm from GPA) on 811 horns with 416-8B/612C cabs using 1201-8A XO without the boost circuit (0.3 mH and Lpad) in front but with the Zobel compensation equalizer across the driver to sound much-much better than using the same components with the stock 1201-8A.

Thanks again!