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History of the manufacturer  

Electro-Voice Inc.; USA

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Name: Electro-Voice Inc.; USA    (USA)  
Abbreviation: electro-vo
Products: Model types Others

Electro-Voice Inc., a division of Bosch; 12000 Portland Ave South, Burnsville, Minnesota 55337, USA. Also located in Lincoln, Nebraska, USA.  Previous factory locations in South Bend Indiana, Buchanan Michigan, Newport and Sevierville Tennessee, and Gananoque Ontario.

Founded: 1927
From the site: : The story of Electro-Voice is a classic American success story. Over the course of time, EV has grown into one of today's dominant forces in the design and manufacturing of leading-edge products for audio professionals. It is recognized the world over as a leader in audio technology.

From its humble beginnings, the company has evolved. Some of its "milestones" are:
1927 The company was founded by Al Kahn and Lou Burroughs in the basement of the Century Tire and Rubber Company in South Bend, Indiana as Radio Engineers.

1930 Kahn and Burroughs develop a public address system for Knute Rockne, the football coach at Notre Dame University. Rockne uses the system to address his team during drills on 4 adjacent fields. He calls the system his "Electric Voice."

1934 EV invents the hum-bucking coil, allowing microphones to be used close to lights and other electrical devices without hum. This design element is still used by nearly every company today.

1940 Electro-Voice introduces the noise-cancelling microphone to the military, which revolutionizes tank and aircraft communications. In the aftermath of World War II, the company is awarded a Congressional Citation for this important contribution to the war effort.

1954 EV introduces Variable-D microphone technology, a means of minimizing the up-close bass boost inherent in single-D directional microphones. Variable-D improves vocal intelligibility for live sound, recording and broadcast applications.

1957 EV invents the stereo magnetic phono cartridge.

1963 EV receives an Academy Award---the first ever for an audio product---from the Academy of Motion Picture Arts and Sciences for the development of the 642 Cardiline shotgun microphone. This product significantly advances the quality of sound on film.

1970 EV becomes the first company to widely adopt the philosophy of Australian physicists Thiele and Small and use vented low-frequency enclosures. Enclosures built using these criteria have deeper bass response and lower distortion than horn designs and higher sensitivity than sealed systems.

1974 Electro-Voice develops constant-directivity (CD) horns, which allow a loudspeaker to maintain its coverage angles over a wide frequency range with more uniform sound quality.

1986 EV revolutionizes concert sound reinforcement by introducing Manifold Technology. Manifold Technology allows the combining of the outputs of multiple drivers into a single horn or low-frequency enclosure without destructive interference. The result is a physical package that is a fraction of the size with much greater acoustic output capability.

1997 EV invents Ring-Mode Decoupling (RMDTM), a revolutionary approach to minimizing acoustical and mechanical resonances in loudspeakers. Speaker systems with RMD have improved clarity and resolution, especially in the vocal range.

2000 EV introduces VOBTM technology, an innovative mechanical design that significantly reduces proximity effect and improves vocal intelligibility in single-D microphones.

2000 EV introduces ClearScan wireless technology that enables automatic scanning and selection of UHF channels.

Some models:
Country Year Name 1st Tube Notes
USA  48 Cardax 950    
USA  60 674    
USA  30 Double Button Carbon Microphone    
USA  67 EV-1179   Stereo receiver. 
USA  34 77   The Electro-Voice 77 is a microphone with a -40 db output and 35-6500 Hz response. 
USA  61 951   The Electro-Voice 951 is a crystal cardioid microphone with on-off switch and 18 foot cable. 
USA  61 729SR   The Electro-Voice 729SR is a ceramic cardioid microphone with a desk stand and 8.5 foot co... 
USA  61 600D   The Elctro-Voice 600D is a microphone with an output of -55 db. It has a six-foot coiled&n... 
USA  66 Microphone 676   The Electro-Voice 676 is a dynamic cardioid microphone. 
USA  68 Microphone 717   The Electro-Voice 717 is a noise-cancelling, handheld microphone. 
USA  60 623   The Electro-Voice Model 623 dynamic microphone is an omnidirectional type for use ... 
USA  54 Crystal Microphone 926   Electro-Voice Crystal Microphone Model 926. Slim-Design Frequency Response 70-8000H... 


Further details for this manufacturer by the members (rmfiorg):

Werbung 1970tbn_usa_ev_michigan_ad_1970.jpg
Electro Voice logo from 1969tbn_us_electro_voice_logo_1969.jpg
Electro-Voice logo from 1966tbn_us_electro_voice_1966_logo.jpg