Greets!
Using published specs, HR calcs a 83.3257 dB Spl mid band [600-900 Hz] efficiency and based on the horn's measurement its gain averages ~ +8 dB = ~91.3 dB Spl in the 200-600 Hz BW, which seems a bit much from such a small horn, so guessing he measured it where it's shown in the picture.
Using published specs, HR calcs a 83.3257 dB Spl mid band [600-900 Hz] efficiency and based on the horn's measurement its gain averages ~ +8 dB = ~91.3 dB Spl in the 200-600 Hz BW, which seems a bit much from such a small horn, so guessing he measured it where it's shown in the picture.
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