Simple Explanation

A speaker layout using a tweeter between two midrange drivers, typically for better sound dispersion.

Concise Technical Definition

A loudspeaker configuration (MTM – Midrange-Tweeter-Midrange) developed by Joe D’Appolito, using symmetrical driver placement and a specific crossover network to improve vertical dispersion and reduce lobing.

Layman-Friendly Analogy

Like sandwiching a delicate voice between two strong speakers so it’s clearer and more balanced from all angles.

Industry Usage Summary

Common in high-end home audio and studio monitors, the D’Appolito MTM design ensures consistent sound quality and imaging over a wide listening area.

Engineering Shortcut

MTM layout = minimized lobing + symmetric vertical dispersion + 3rd-order crossover.

Full Technical Explanation

The D’Appolito configuration, named after Joe D’Appolito, is a type of speaker layout that places a tweeter between two midrange drivers in a vertical MTM (Midrange-Tweeter-Midrange) arrangement. It is designed to reduce vertical off-axis lobing (interference patterns caused by driver spacing) and improve the phase alignment and directivity. This setup is often paired with a 3rd-order crossover network, which helps maintain symmetrical acoustic output and improved imaging. It is particularly beneficial in two-way speaker systems or compact three-way designs, frequently used in high-fidelity and studio monitor applications.