Placid Preamplifiers for microphones (Sound Level Meter) Type Frequency Response Input Impedance Output Impedance Output Connector Type Diameter (Inch) Weight Length PNV21 5 Hz to 100 kHz > 5 G Ω < 110 Ω 7-pin LEMO 1/2 ” Inch 28 Gram 80 mm PNP21 5 Hz to 100 kHz > 5 G Ω < 110 Ω BNC or TNC 1/2 ” Inch 25.5 Gram 84.5 mm PNP2122S 5 Hz to 100 kHz > 5 G Ω < 110 Ω BNC 1/2 ” Inch 25.5 Gram 39.3 mm PNP22 5 Hz to 100 kHz > 5 G Ω < 110 Ω SMB 1/2 ” Inch 14.5 Gram 35 mm PNP41 5 Hz to 100 kHz > 1.5 G Ω < 110 Ω SMB 1/4 ” Inch 6.5 Gram 58 mm PMP4023 10 Hz to 40 kHz — < 110 Ω SMB 1/4 ” Inch 3.5 Gram 30 mm Please Click and Download this product datasheet for further information {6}