You get three octaves of horn loading and then the horn attenuates the signal at 24db/octave below the lower knee and 6dB/octave above the upper knee. So a horn with a lower knee of 42Hz will have an upper knee of about 336Hz regardless of the driver, and will attenuate higher frequencies at 6dB/octave.
EDIT: Have you figured out why 42Hz is about 15dB down? |
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