A simplified on-axis frequency response of the electrostatic loudspeaker using linear approximations is shown in Fig. 15.18, although the full response from the analogous circuit of Fig. 15.16 together with Eq. (15.92) is given by

$\tilde{p}\left(r\right)=j{\epsilon}_{0}k{a}^{2}\varsigma \xb7\frac{{E}_{P}}{d}\xb7\frac{{\tilde{e}}_{\text{in}}}{2d}\xb7\frac{{e}^{-}}{}$

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