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MP3, Portable Audio

Speakers

Speakers Article

Alexander Graham Bell patented the first electrical loudspeaker as part of his telephone in 1876, which was followed in 1878 by an improved version from Ernst Siemens. Nikola Tesla reportedly created a similar device in 1881, but was not issued a patent. During this time, Thomas Edison was issued a British patent for a system using compressed air as an amplifying mechanism for his early cylinder phonographs, but he ultimately settled for the familiar metal horn driven by a membrane attached to the stylus. In 1898, Horace Short patented a design for a loudspeaker driven by compressed air, then sold the rights to Charles Parsons, who was issued several additional British patents before 1910. Several companies, including Victor and Pathe, produced record players using compressed-air loudspeakers. However, these designs were significantly limited by their poor overall sound quality and their inability to reproduce sound at low-volume. Variants of the system were used for public address applications, and much more recently other variations have been used to test space equipment for resistance to the very loud sound levels launch rockets produce (ca, 165 dB SPL).

The modern design of moving-coil drivers was established by Oliver Lodge in (1898). The moving coil principle was patented in 1924 by Chester W. Rice and Edward W. Kellogg.

These first loudspeakers used electromagnets because large, powerful permanent magnets were not available at reasonable cost. The coil of an electromagnet, called a field coil, was energized by current through a second pair of connections to the driver. This winding usually served a dual role, acting also as a choke coil filtering the power supply of the amplifier to which the loudspeaker was connected. AC ripple in the current was attenuated by the action of passing through the choke coil; however, AC line frequencies tended to modulate the audio signal being sent to the voice coil and added to the audible hum of a powered-up sound reproduction device.


Speakers Items

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NEW BOYNQ SOUND2GOWH Sound2Go Travel Speaker with Po...

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Philips Portable Speakers - For MP3, CD, PC, etc.

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Midiland TD-130 system ( AdvanceTime Domain Technology)

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Athena iVoice iPod Speaker system

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Midiland TD-130 system ( AdvanceTime Domain Technology)

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NEW Philips MMS460 Speaker System

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iMicro 2.0 Channel Multimedia Speaker System (Black)

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Peavey Decal Sticker

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NR BANGIN SONY SRS-P7 STEREO SPEAKERS IPOD ADAPTABLE

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Athena iVoice iPod Speaker system

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iPod Docking Tube Speaker * Video Output * FM Radio

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NEW Pyle PylePro PDIC60 In-Ceiling Speaker

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Sony Passive Mini Speakers-Model SRS-P7/90 Day Warranty

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SONY 900 MHZ WIRELESS SPEAKER SYSTEM SRS-RF930RK

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NEW Speaker Rough-in Kit

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Sony Stereo Speaker System SRS-P7

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NEW Phoenix Gold AS5S In-Wall Speaker

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NEW Philips MMS171 Speaker System

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NEW Pyle PDIW55 Speaker

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NEW SW-102 Portable Speaker System

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NEW Computer Expressions Portable Stereo Speakers

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NEW Pyle PD-IW65 6 1/2" 2-Way 200-Watt In-Wall Speaker

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NEW Maxell P-18 Portable Speakers

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NEW AUDIOSOURCE IN-CEILING LEFT CENTER

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NEW iSymphony CR1 Clock Radio Music System with Buil...

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NEW JWIN JSP15 Mini Stereo Speakers for MP3 Players ...

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NEW Sonance HFW8R In-Ceiling 2-way Speaker

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iPod Docking Tube Speaker * Video Output * FM Radio

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NEW Pyle PylePro PDIC80 In-Ceiling Speaker

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NEW Computer Expressions 54094 Portable Stereo Speak...

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NEW Pyle PylePro PDIC80T In-Ceiling Speaker

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NEW Altec Lansing VS2421 Multimedia Speaker System

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NEW Phoenix Gold ATC8 In-Ceiling Speaker

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NEW Sonance HFW5 In-wall Speaker

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Coby CSP31 Personal Mini Stereo Speaker System

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NEW JBL SP-6CII 6 1/2" 2-Way 80-watt In-Ceiling Spea...

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NEW jWIN JS-P55 Mini Stereo Speakers

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Pair hello kitty Portable Speaker MP3 Audio PC laptop

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NEW Altec Lansing FX4021 Speaker System

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Midiland TD-130 system ( AdvanceTime Domain Technology)

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NEW HTI6C In-Ceiling Speaker System

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NEW Genius SW-5.1 1000 25-watt 6-piece Speaker Syste...

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NEW Phoenix Gold ATC6 In-Ceiling Speaker

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NEW Pyle PylePro PDIC81RD In-Ceiling Speaker

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NEW M&S Systems In-Ceiling Speaker Rings

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SONY PORTABLE WHT SPEAKERS IPOD CD MP3 WALKMAN NEWinPKG

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NEW Altec Lansing VS2420 Multimedia Speaker System

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NEW M&S Systems In-Wall Speaker Rings

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NEW Pyle PDIW67 6 1/2" Two-Way In-Wall Enclosed Spea...

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Saitek A-200 Portable 2.1 Speaker System

$8.29
NEW Phoenix Gold ATC5 In-Ceiling Speaker

$64.99