Speaker

Device that converts electrical signals into sound

For other uses, see Speaker (disambiguation).

A speaker is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound. The most common type of speaker is the dynamic speaker, which operates on the same basic principle as a dynamic microphone, but in reverse to produce sound.

History

The first loudspeakers were developed in the late 19th century as part of early telephone systems. The modern dynamic speaker was invented in 1925 by Edward W. Kellogg and Chester W. Rice. Their design has remained largely unchanged, though materials and manufacturing techniques have evolved.

Types of Speakers

Speakers come in various types and sizes, each designed for specific applications:

• Subwoofer: Designed to reproduce low-frequency sounds, typically below 200 Hz.
• Woofer: Handles low to mid-range frequencies, usually from 40 Hz to 1 kHz.
• Mid-range speaker: Reproduces the middle range of the audio spectrum, from 250 Hz to 2 kHz.
• Tweeter: Designed to produce high-frequency sounds, typically above 2 kHz.
• Full-range speaker: Capable of covering a wide range of frequencies, often used in portable audio devices.

Components

A typical speaker consists of several key components:

• Diaphragm: Also known as the cone, it vibrates to produce sound waves.
• Voice coil: A coil of wire that moves in response to the electrical signal, causing the diaphragm to vibrate.
• Magnet: Provides a magnetic field for the voice coil to interact with.
• Suspension: Includes the spider and surround, which keep the diaphragm centered and allow it to move freely.

Applications

Speakers are used in a wide range of applications, including:

• Home audio systems
• Public address systems
• Theater sound systems
• Portable audio devices
• Automotive audio

Related Pages

• Microphone
• Amplifier
• Sound
• Acoustics
• Audio signal processing

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