Dual-Cone Horn Speaker Diagram - Engineering Illustration & Acoustic Design #208092 (License: Personal Use)

This black-and-white engineering sketch depicts a dual-cone horn loudspeaker, featuring two concentric conical diaphragms mounted on a central shaft with mechanical couplings. The ribbed internal surfaces suggest acoustic impedance matching and structural reinforcement, common in mid-20th-century public address or broadcast equipment. The drawing emphasizes functional geometry over aesthetic detail, typical of patent or service manual illustrations.

Used in technical documentation, audio history articles, museum exhibits, or educational resources about analog sound reproduction; targets engineers, hobbyists, and historians seeking to understand vintage transducer mechanics.