Vintage Electro Voice Royal 400

That plot seems to fit the frequency response plot from the manual. Looks like each line here is 5dB, so the horn tweeter is down by 10dB from 6kHz to 20kHz.
 

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    Frequency Response.jpg
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Thanks. Yes, OK fit 2000-5000 Hz. As a research guy, I'm amazed whenever data lines up even half decently.

The EV horn tweeters (T35 an T350) were considered SOTA 60 years ago. But barely compare to a $20 soft-dome fried egg tweeter today, except for max loudness. (One of my greatest ever tweeters was made from 9 fried eggs in a semi-circular array.)

B.
 
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I've always liked the T35 and used it with a tractrix midhorn in my K-horn setup. It does not have that much rolloff imo. That makes me wonder where EV put the L-pad settings for their curve.

Look at that crossover scheme - the tweeter's L-pad is daisy chained from the output of the 8 inch midrange speaker's L-pad. The nominal 3uF cap's feed could be moved easily so the tweeter's adjustment would be independent and there could be a brighter presentation if one wanted one.

mQHVly7.jpg
 
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