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Page from the Codex canadensis, by Louis Nicolas, circa 1675 to 1682, showing a native North-American chief using a megaphone made of bark. Before it became a megaphone, the bull horn or cow horn or steer horn was a signaling device or bugle used from antiquity. [1] [2] The initial inventor of the speaking trumpet is a subject of historical ...
A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.
Speaker stands, therefore were purpose-built to remove any deleterious colourations that came about through unwanted vibration. Further research has shown that speakers are best positioned so that the tweeter is level with the ear of the listener and so speaker stands are often built so that they line up the speakers with the ear of a person ...
PMC speakers: United Kingdom Polk Audio: United States ProAc: United Kingdom PSB Speakers: Canada QSC Audio Products: United States Quad Electroacoustics: United Kingdom (brand) Radio Shack: United States RCF audio: Italy Rectilinear Research Corporation: United States Rega Research: United Kingdom Renkus-Heinz: United States ReVox: Switzerland ...
Early public-address system from around 1920 using a Magnavox speaker. The microphone had a metal reflector that concentrated the sound waves, allowing the speaker to stand back so it would not obscure his or her face. The early vacuum tubes could not produce much gain, and even with six tubes the amplifier had low power.
An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.
Model Eight Radio Model 41 Reel-to-Reel Tape Deck. KLH Audio is an American audio electronics company based in Noblesville, Indiana. [2] Originally founded in 1957 as KLH Research and Development Corporation in Cambridge, Massachusetts, the company takes its name from the initials of its founders: Henry Kloss, Malcolm S. Low, and Josef Anton Hofmann.
1947 – JBL has a 15" speaker (38 cm), model D-130, using for the first time a 4" (100 mm) voice coil in a speaker cone; 1949 – James. B. Lansing dies of suicide; William Thomas became president of the company; 1954 – The 375 compression engine is the first 4-inch engine sold; its response extends to 9 kHz
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1747 Olentangy River Rd, Columbus, OH · Directions · (614) 299-9425
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