Simple Explanation

A speaker horn that gradually widens in size to boost and direct sound more efficiently.

Concise Technical Definition

A type of acoustic horn where the cross-sectional area increases exponentially along its length, improving efficiency and controlling directivity.

Layman-Friendly Analogy

Like a megaphone that gets wider in a smooth curve to help your voice carry farther and louder.

Industry Usage Summary

Common in PA systems, horn-loaded tweeters, and vintage hi-fi designs for improved output and directional control at mid and high frequencies.

Engineering Shortcut

Horn with flare rate increasing exponentially; boosts efficiency and narrows dispersion.

Full Technical Explanation

An exponential horn is a waveguide used in loudspeakers, particularly high-frequency drivers, designed so its cross-sectional area increases exponentially with distance from the throat to the mouth. This flare profile efficiently couples the driver to the air, providing increased acoustic output and controlled dispersion. The exponential shape helps maintain impedance matching between the driver and open air, improving sensitivity and reducing power requirements. Compared with other horn profiles (like conical or tractrix), exponential horns emphasize efficiency and SPL but may introduce more coloration or "honk" if not carefully implemented.