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