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Pressure gradient receiver with short interference tube · Employs RF-technology to control residual microphone noise. Optimizing the transducer's acoustic impedance results in a further improvement in low noise performance · The RF-design yields low noise levels and high immunity to humidity and moisture · The comparatively low RF-voltage across the elements of the transducer also eliminates arcing and DC-bias creeping currents · Hypercardioid at low and medium frequency, above 2 kHz approaches lobar pattern