Parallel, 1380 Hamel Rd, Hamel, MN 55340, US

Audio Research is one of the oldest continually operating manufacturers in the American audio industry. The company was established in 1970 to advance music reproduction. Audio Research helped refocus the audio industry on designing products for musical performance. The company s technicians can repair, refurbish and restore, to original performance standards, any product ever manufactured during the company's history. The company s products include preamplifiers, power amplifiers, reference series, vacuum tubes and source components. Audio Research occupies a 48,000 square-foot production plant and administrative headquarters in Plymouth, Minn., where approximately 50 technical, assembly and support staff guide the product line from concept to finished goods. A research-only facility has also been established in Palm Desert, Calif.