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Figure 9
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Sound Pressure Level measured with a microdischarge microphone (d = 45 μm) and a reference microphone for various voltages VL applied to the loudspeakers. Magnitude in dB SPL: 20 log(Pmic/Pref) with Pref = 20 × 10−6 Pa. Operating point of the discharge: Ud ≃ 420 V, I ≃ 60 μA. Fitted sensitivity: Sp2V ≃ 0.4 × 10−9 A/Pa.
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