By 1964, the Sundholm brothers had designed a high-powered bass amplifier, and the Sunn Musical Equipment Company was founded. In the late 1960s and early 1970s, the popularity of Sunn amps exploded. Much louder and more powerful than similar equipment of the time, the company’s amplifiers and speakers were used by some of the biggest names in rock and roll, including Jimi Hendrix, The Who, Kiss, Queen, and Black Sabbath. Sunn amplifiers became synonymous with the heavy, overdriven sound of early heavy metal and hard rock. https://sunnamps.com/history/