Direct-radiator loudspeakers become more efficient as the total magnetic flux is increased, but the accompanying equalization and amplifier modify the gains thus made. We study the combination of an efficient high-Bl driver with several amplifier types, including a highly efficient class-D amplifier. Comparison is made of a typical simulated driver, excited with a few different amplifier types, using various audio signals. The comparison is quite striking as the Bl value of the driver increases, significantly favouring the class-D amplifier.
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