[Feature Article] To many people, power amplifiers are seen as a necessary but rather uninspiring part of the audio signal chain—black (or perhaps silver) boxes that make small signals bigger. Nothing should be simpler, one might think. Until recently amplifier technology had remained relatively unchanged for many years, with any advances involving what was really a number of variations on a theme. For a long time there had been no fundamental paradigm shift in the way in which amplifiers make small signals bigger. Now, however, a quiet revolution is taking place.
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