High Efficiency Speakers (HES) significantly improve electrical to sound power conversion efficiency by reducing the power dissipation over the speaker coil. However, they require some equalization of the input signal. In this paper, a new driving technique based on a PWM switching amplifier is presented. This exploits a double voltage/current feedback to obtain automatic equalization. Furthermore, thanks to the double feedback, the output resonant filter can be included in the feedback path, compensating for its non-linearity. Finally, the mixed feedback acts as intrinsic current-limiter. Both theoretical analysis and simulations demonstrate that this system is feasible. The results were also confirmed by measurements using a prototype.
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