Electrovoice Duchess IV

Hello all,

I know there's a vintage forum, but it doesn't look like it gets any traffic, so...

Do any of you know anything about Electrovoice Duchess IV speakers? Year unknown, although I suspect 1960, +/-5 years. Even Google doesn't seem to know, and I'm sure you'll all agree that's pretty odd.

I'm just wondering what, assuming they're in working, I can expect. They appear to have 12s or 15s with a fairly large horn. How would a typical modern amp run them? I guess drivers of that era were not as efficient as they are now.

Any comments would be appreciated. Thanks!