Simple Explanation

A device that doesn't require any power to operate, typically referring to components like speakers, crossovers, or resistors.

Concise Technical Definition

A circuit or device that lacks active elements and doesn’t require an external power source to function. In the case of passive speakers, they rely on amplification from an external source.

Layman-Friendly Analogy

It's like a passive speaker that doesn’t need a power plug to work—just like a simple fan that spins when the air moves through it. The device works without needing an electrical power supply.

Industry Usage Summary

In audio equipment, passive components like crossovers, resistors, capacitors, and inductors are used to filter signals without needing an external power supply. Passive speakers, for example, require amplification from an external source, as they have no internal power or active amplification. Passive components are used in many areas of audio, including subwoofers, where a passive radiator helps manage air pressure without a direct power connection.

Engineering Shortcut

A component or circuit that doesn’t require an external power source to function.

Full Technical Explanation

A passive device or circuit refers to any component that does not require external power to function. This includes components such as resistors, capacitors, inductors, and passive speakers. Passive devices do not have active elements such as transistors or integrated circuits that require power. For example, a passive speaker relies on an external amplifier to power it, and passive crossovers are used in speakers to divide frequencies without requiring an external power source. In some speakers or subwoofers, a passive radiator is a driver or diaphragm that moves in response to air pressure but is not electrically powered or connected to the amplifier.