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Earth Sound Research was a musical amplification firm based in Farmingdale, New York that made bass and guitar amplifiers in the 1970s. They also made PA mixers/power amps, keyboards and stand alone reverb units (solidstate).
In addition they manufactured ESR distortion pedals, and volume pedals. The two owners were Marc Neumann and Dave Garrett.
References
Earth Sound Research Wikipedia(Text) CC BY-SA