Originally Posted by
bowtie427ss
AFAIK, Kustom only used small format 3/4 inch throat threaded drivers. So i kinda doubt the ebay horn requiring the adapter was from Kustom. Sure looks like it could have come from the same manufacturer though.
A WAG of mine on that particular design is that there were optional throats to accommodate one, two, or four 1 inch compression drivers similar to what Cerwin Vega was doing in the late 60's/early 70's. I don't think it was to adapt large format drivers. The 800hz cutoff doesn't seem to a lot of sense for large format. But, that's not to say it's impossible.