That's some horn!!! Do you have a matching one?
They didn't need bass for PA systems, 200hz was more than adequate, aside from the large WEs I don't know of any complete speaker system that crossed over their horns below 500hz. Many of those old woofers were actually full range drivers, 50hz-2khz efficient, light and fast so integration with the horn wasn't as difficult as it is today. Even JBL who design and manufacture everything don't bother making light efficient cones anymore, hence the latest Everests.
david
Yes I do have a pair in use in my system.They appear much smaller than they are.
In any full range horn system the most difficult area to get right is the decade 100-1000Hz.Ironically that is where 90% of music happens.Whatever the designer do will be a compromise: stretching large cone drivers to highs where they should not do,stretching compression drivers to lows they should not go or use "fillers" with or without horns.Avantgardes compromise to stretch horns as wide as possible seems to be as valid as any other compromise to achieve the same.