Loudspeakers Stocks List
Symbol | Grade | Name | % Change | |
---|---|---|---|---|
VOXX | C | VOXX International Corporation | -2.36 | |
SONO | D | Sonos, Inc. | -3.91 |
Related Industries: Auto Parts Consumer Electronics
Symbol | Grade | Name | Weight | |
---|---|---|---|---|
PSCD | C | PowerShares S&P SmallCap Consumer Discretionary Portfolio | 0.87 | |
VIOV | C | Vanguard S&P Small-Cap 600 Value ETF | 0.23 | |
SLYV | C | SPDR S&P 600 Small Cap Value ETF (based on S&P SmallCap Value Index | 0.22 | |
FLQS | B | Franklin LibertyQ U.S. Small Cap Equity ETF | 0.19 | |
AVSC | C | Avantis U.S. Small Cap Equity ETF | 0.18 |
Compare ETFs
Date | Stock | Title |
---|---|---|
Sep 26 | SONO | This Nordstrom Analyst Is No Longer Bullish; Here Are Top 5 Downgrades For Thursday |
- Loudspeakers
A loudspeaker is an electroacoustic transducer; a device which converts an electrical audio signal into a corresponding sound. The most widely used type of speaker is the dynamic speaker. The sound source (e.g., a sound recording or a microphone) must be amplified or strengthened with an audio power amplifier before the signal is sent to the speaker.
The dynamic speaker was invented in 1924 by Edward W. Kellogg and Chester W. Rice. The dynamic speaker operates on the same basic principle as a dynamic microphone, but in reverse, to produce sound from an electrical signal. When an alternating current electrical audio signal is applied to its voice coil, a coil of wire suspended in a circular gap between the poles of a permanent magnet, the coil is forced to move rapidly back and forth due to Faraday's law of induction, which causes a diaphragm (usually conically shaped) attached to the coil to move back and forth, pushing on the air to create sound waves. Besides this most common method, there are several alternative technologies that can be used to convert an electrical signal into sound.
Speakers are typically housed in a speaker enclosure or speaker cabinet which is often a rectangular box made of wood or sometimes plastic. The enclosure's materials and design play an important role in the quality of the sound. The enclosure generally must be as stiff and non-resonant as practically possible. Where high fidelity reproduction of sound is required, multiple loudspeaker transducers are often mounted in the same enclosure, each reproducing a part of the audible frequency range (picture at right). In this case, the individual speakers are referred to as drivers and the entire unit is called a loudspeaker. Drivers made for reproducing high audio frequencies are called tweeters, those for middle frequencies are called mid-range drivers and those for low frequencies are called woofers. Extremely low frequencies (16Hz-~100Hz) may be reproduced by separate subwoofers.
Smaller loudspeakers are found in devices such as radios, televisions, portable audio players, computers, and electronic musical instruments. Larger loudspeaker systems are used for music, sound reinforcement in theatres and concert halls, and in public address systems.
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