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Threshold Audio
Threshold Audio is a high-end audio equipment manufacturer originally established in California in 1974 by audio engineer Nelson Pass. The company, today based in Houston Texas, manufactures mono-block and stereo power amplifiers, multi-channel power amplifiers and stereo control amplifiers.
== Nelson Pass and the founding of Threshold ==
In the early 1970s, Nelson Pass was studying Physics at the University of California-Davis. While a student, he founded PMA to design and manufacture speakers. In 1972, he joined ESS speakers in Sacramento just prior to the arrival of Oscar Heil, who would design the Heil Air Motion Transformer which was a key component of the ESS AMT series of speakers. Pass worked at ESS designing crossovers and enclosures through 1973. He also was a service manager for Sun Stereo performing repairs on McIntosh Laboratory, Phase Linear, Pioneer Corporation and other brands of amplifiers, and began formulating his own amplifier designs in 1974.〔Didden, Jeff. We Interview Nelson Pass. Multi Media Manufacturer, January–February 2010〕
Pass received his Bachelor of Science in Physics and with an ESS associate René Besne they together began development of a new amplifier in 1974. Besne worked on the industrial design of the amplifier while Pass worked on the circuit topology and component selection. When they were confident the amplifier was ready to market, Pass incorporated Threshold in Sacramento, California on December 5, 1974.〔Norton, Thomas J. Nelson Pass: Simple Sounds Better. Stereophile, November 1991.〕
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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