Hi Mike,

Hope someone can use the plans.

I?m pretty sure the 32A horn differs from the B only in the driver mounting. The older WE small format drivers had three mounting bolts and the newer Altec versions have two. I don?t have them right in front of me but I believe my cast aluminum horns are marked 32B

At any rate, have you tried any of the Altec contour networks to flatten out the upper range with these horns? I think GM posted a few years back that hf dispersion is better with a 32 horn which leads me to believe that something on the order of a contour network designed for CD horns would be in order. My ears are older though so ultra high frequencies are not much of an issue for me.