Simple Explanation

A device that turns electrical signals into sound you can hear.

Concise Technical Definition

An electromagnetic transducer that converts electrical energy into acoustic energy using a magnet, voice coil, and diaphragm (usually a cone).

Layman-Friendly Analogy

Like a musical translator—it takes electric signals and speaks them as sound.

Industry Usage Summary

The core output device in audio systems, used in everything from home stereos to PA systems; includes subwoofers, woofers, midrange drivers, and tweeters.

Engineering Shortcut

Electromagnetic transducer: electrical in, sound out.

Full Technical Explanation

A loudspeaker is an electromagnetic transducer that converts the electrical output of a power amplifier into acoustic energy—i.e., sound. The most common type is the dynamic loudspeaker, which operates on the principle of electromagnetic induction. It consists of a voice coil (a coil of wire) suspended in a magnetic field, attached to a cone or diaphragm. When current flows through the coil, it creates a magnetic field that interacts with the permanent magnet, causing the cone to move back and forth and displace air—thus producing sound waves. Loudspeakers are categorized by frequency range: woofers (bass), midrange drivers, tweeters (high frequencies), and subwoofers (very low bass). Loudspeakers can be passive (requiring an external amplifier) or active (with built-in amplification).