Threshold SA/1 Owner's Manual The History of Threshold Threshold Audio was established in California in 1974 by audio engineer Nelson Pass and graphic designer Rene Besne. Cleaned controls, switches, and chassis.Added fast electrolytic caps to the power supply to shorten response time.Replaced all lamps in the displays with LED.Production 1984-88 Condition 9/10 Serial No. They will ship in their original boxes, and the manuals are included. They're well balanced, and each deliver a clean 180 watts – 20 watts better than manufacturer spec. This spectacular pair comes from a single-owner system, and has been fully serviced. With unparalleled transparency, detail, and depth of image, the SA/1 is an outstanding monoblock. The Threshold SA/1 is arguably the amplifier that canonized Nelson Pass' place in hifi history.
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