Patent ID: 8705767

Claim:
An electrostatic speaker system comprising a high voltage switching power amplifier having at least one high voltage switching output stage ( 100 ); an extraction filter ( 102 ) having an input coupled to an output of the at least one high voltage switching output stage ( 100 ); and an electrostatic speaker element having a capacitive load ( 104 ), wherein the capacitive load forms a part of the extraction filter ( 102 ), the capacitive load being connected to an output of the extraction filter, the extraction filter having at least a first low pass filter stage ( 106 ) connected in series with a second low pass filter stage ( 108 ), the first filter stage comprising a RLC circuit having a resonant frequency ω 0 and a quality factor Q>½ and the second filter stage having at least one electrical element for damping a signal component at the resonant frequency of the RLC circuit at the output of the extraction filter ( 102 ).