why are horns long throw?

[nick mineau]

what makes a bass horn long throw, compared to a reflex sub? Doesn't all sound drop at 6db per doubling of distance?
how do horn subs defy this?

[Bill Fitzmaurice]

Horns are not long throw. The only speakers that don't drop at 6dB are line arrays, which drop at 3dB within their near field.
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