Citation XX
In the late 1970s, the Harman Kardon Citation XX power amplifier was called "the world's best-sounding power amplifier" by the editors of The Audio Critic, a magazine published in the USA. The amplifier was designed by Finnish Dr. Matti Otala (born December 26, 1939) who discovered transient intermodulation distortion (TIM) in 1970 and worked to mitigate its effects in the following years. The Citation XX was an at-any-cost project with the single goal of the best possible measurements of output signal, and the best perceived sound.
Read more about this topic: Harman Kardon