NT4 SPECIFICATIONSAcoustic PrinciplePressure GradientActive ElectronicsJFET impedance converter with bipolar output bufferCapsule0.50"Polar PatternAddress TypeEndFrequency Range20Hz - 20kHzOutput Impedance200ΩMaximum SPL143dBSPLMaximum Output Level13.9mV (@ 1kHz, 1% THD into 1KΩ load)Sensitivity-38.0dB re 1 Volt/Pascal (12.00mV @ 94 dB SPL) +/- 2 d..

..

PROCASTER SPECIFICATIONSAcoustic PrincipleDynamicPolar PatternAddress TypeEndFrequency Range75Hz - 18kHzOutput Impedance320ΩSensitivity-56.0dB re 1 Volt/Pascal (1.60mV @ 94 dB SPL) +/- 2 dB @ 1kHzWeight745.00gDimensions214.00mmH x 53.00mmW x 53.00mmDOutput..