Since the vertical coverage angle of sectoral and multicellular horns increases as frequency decreases and a second horn is usually added to cover the front rows for the higher frequencies, a hump is often created in the response between 600-3kHz in the front area. This paper discusses a method of reducing the hump in the front "house" curve, making the transition from the front row to the rear row smoother, with a controlled decrease in high frequency response similar to that due to air absorption.
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https://aes2.org/publications/elibrary-page/?id=2363
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