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Schaffer-Vega Diversity System
The Schaffer-Vega Diversity System (SVDS) was a wireless guitar system developed in June 1976, engineered and prototyped by Ken Schaffer in New York City, and manufactured by the Vega Corporation, El Monte, California. A handheld microphone version was introduced in 1977.
The system was the first cordless system to be adopted by major rock acts because it solved technical problems common to earlier wireless systems. The reliable sound and freedom of movement it provided paved the way for bands to tour with large multi-level stages in arenas. Schaffer-Vegas were used in the late 1970s and early 1980s by many rock bands such as the Rolling Stones, AC/DC and Kiss.
==Background==
New York-based engineer Ken Schaffer traveled with the Rolling Stones on the Tour of The Americas '75.〔(), I Want My Moscow TV, December 2, 2004〕 Early wireless microphone systems suffered from frequent signal fades and radio interference. As well, the poor dynamic range of the wireless system Mick Jagger had previously used degraded the reproduction of the quality of his voice. Schaffer was versed in techniques in radio link design and studio recording that were used to resolve related audio problems.〔() Guitar Player Magazine, March 1979, p. 100-101.〕
After prototyping the wireless system, Schaffer arranged its manufacture by the Vega Corporation, based in El Monte, California. The first bands to use Schaffer-Vega Diversity System were Kiss and Electric Light Orchestra.〔 Though wireless systems afford great mobility on stage, Kiss switched to a wireless system for safety reasons: lead guitarist Ace Frehley had been knocked unconscious by a near-fatal shock traced to a voltage potential between his wired guitar connection and a metal staging element.〔( Kiss: Ace Frehley Interview ) by Tom Wheeler and Steve Rosen, Guitar Player Magazine, 1979〕 Going wireless with all guitars and microphones eliminated this hazard.〔() Ace Frehley: "I'd Love To Do An Instructional Video〕〔() The Kiss Shows: July 1, 1976 - April 4, 1977〕 David Gilmour of Pink Floyd was also an endorsee of Schaffer Vega wireless systems. He first used it on the 1980-81 concerts for ''The Wall'', especially when he performed "Comfortably Numb" from the top of the wall.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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