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Among audio equipment, a speaker (also sometimes called a speaker driver or, especially if audible at a distance, a loudspeaker) is an electroacoustic transducer, that is, a device that converts an electrical audio signal into a corresponding sound. A speaker system, also often simply referred to as a "speaker" or "loudspeaker", comprises one or more such speaker drivers (above definition), an enclosure, and electrical connections possibly including a crossover network. The speaker driver can be viewed as a linear motor attached to a diaphragm which couples that motor's movement to motion of air, that is, sound. An audio signal, typically from a microphone, recording, or radio broadcast, is amplified electronically to a power level capable of driving that motor in order to reproduce the sound corresponding to the original unamplified electronic signal. This is thus the opposite function to the microphone, and indeed the dynamic speaker driver, by far the most common type, is a linear motor in the same basic configuration as the dynamic microphone which uses such a motor in reverse, as a generator. The dynamic speaker was invented in 1925 by Edward W. Kellogg and Chester W. Rice issued as US Patent 1,707,570. Apr 2, 1929. When the electrical current from an audio signal passes through its voice coil—a coil of wire capable of moving axially in a cylindrical gap containing a concentrated magnetic field produced by a permanent magnet—the coil is forced to move rapidly back and forth due to Faraday's law of induction; this attaches to a diaphragm or speaker cone (as it is usually conically shaped for sturdiness) in contact with air, thus creating sound waves.
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Dual 3-Way Indoor/Outdoor Speakers - Pair- White - LU47PW
Dual 3-Way Indoor/Outdoor Speakers - Pair- White - LU47PW
Price:
39.90 USD
Ends:
Feb 12, 02:41 pm
Sony SS-CS5 3-Way Bookshelf Speaker System (Pair)
Sony SS-CS5 3-Way Bookshelf Speaker System (Pair)
Price:
99.99 USD
Ends:
Feb 22, 05:46 pm
Sony - Core Series 5
Sony - Core Series 5" 3-Way Bookshelf Speakers (Pair) - Black
Price:
119.99 USD
Ends:
Feb 02, 02:33 pm
Acoustic Audio 251B Indoor Outdoor 3 Way Speakers 400 Watt Black Pair
Acoustic Audio 251B Indoor Outdoor 3 Way Speakers 400 Watt Black Pair
Price:
45.88 USD
Ends:
Feb 17, 12:01 am
Dual 4 - inch 3-Way Indoor / Outdoor Speakers in Black - Pair
Dual 4 - inch 3-Way Indoor / Outdoor Speakers in Black - Pair
Price:
38.90 USD
Ends:
Feb 10, 01:47 pm
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Pair KLH 979B Indoor/Outdoor Speakers  3-Way
Pair KLH 979B Indoor/Outdoor Speakers 3-Way
Price:
19.95 USD
Ends:
Jan 25, 11:18 pm
Pioneer 6-1/2
Pioneer 6-1/2" 6.5-inch 3-way Coaxial Car Audio Speakers Pair 640w Max
Price:
49.99 USD
Ends:
Jan 27, 04:16 am
Dual Electronics 4
Dual Electronics 4" 3-Way Indoor / Outdoor Speakers - Pair - Black
Price:
38.00 USD
Ends:
Feb 10, 01:31 pm
JBL STUDIO S36II - 3-Way Speakers Pair Tested Working
JBL STUDIO S36II - 3-Way Speakers Pair Tested Working
Price:
140.00 USD
Ends:
Feb 10, 05:58 pm
2x JBL STAGE3 637F 6.5
2x JBL STAGE3 637F 6.5" CAR AUDIO STEREO 3-WAY 225W COAXIAL SPEAKERS 6-1/2 INCH
Price:
59.99 USD
Ends:
Feb 05, 06:31 pm
4 Bids
Paradigm CC-590 V4 Reference Studio Series 3-way Center Channel Speaker in Black
Paradigm CC-590 V4 Reference Studio Series 3-way Center Channel Speaker in Black
Price:
264.00 USD
Ends:
Jan 25, 02:30 am
4x Audiobank 6.5
4x Audiobank 6.5" 3-Way 800W Car Audio Coaxial Speakers - AB1670 Red New w/Grill
Price:
47.99 USD
Ends:
Feb 13, 07:23 pm
Rockford Fosgate R165X3 6.5
Rockford Fosgate R165X3 6.5" 3 Way Full Range Speakers 6 1/2" Pair
Price:
35.00 USD
Ends:
Feb 14, 03:12 pm
Yamaha NS-6490 3-Way Bookshelf Speakers Finish (Pair) Black
Yamaha NS-6490 3-Way Bookshelf Speakers Finish (Pair) Black
Price:
166.99 USD
Ends:
Feb 17, 12:46 pm
Sony SSCS8 2-Way 3-Driver Center Channel Speaker, Black
Sony SSCS8 2-Way 3-Driver Center Channel Speaker, Black
Price:
118.00 USD
Ends:
Feb 05, 04:18 pm
4x JBL STAGE3 637F 6.5
4x JBL STAGE3 637F 6.5" CAR AUDIO STEREO 3-WAY 450W COAXIAL SPEAKERS 6-1/2 INCH
Price:
119.99 USD
Ends:
Feb 05, 07:00 pm
0 Bids
ELAC Uni-Fi UB5 3-Way Bookshelf Speakers (Pair) - Black
ELAC Uni-Fi UB5 3-Way Bookshelf Speakers (Pair) - Black
Price:
275.00 USD
Ends:
Jan 24, 12:11 am
PSB SPEAKERS ALPHA P3 2-WAY BOOKSHELF SPEAKER SET
PSB SPEAKERS ALPHA P3 2-WAY BOOKSHELF SPEAKER SET
Price:
149.99 USD
Ends:
Feb 18, 07:50 pm
Vintage Kenwood Speakers JL-630W 3 way speaker system Tested working
Vintage Kenwood Speakers JL-630W 3 way speaker system Tested working
Price:
149.00 USD
Ends:
Feb 14, 06:52 am
Sony SSCS5 3-Way 3-Driver Bookshelf Speaker System (Pair)
Sony SSCS5 3-Way 3-Driver Bookshelf Speaker System (Pair)
Price:
118.00 USD
Ends:
Feb 20, 08:17 pm
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