User Guide

18
Specifications of the C 391 B:
Electrical working principle: condenser microphone, self-
polarized
Acoustical working principle: pressure gradient receiver
Frequency range: 20–20,000 Hz ±2 dB from nominal
frequency curve
Open-circuit sensitivity (at 1000 Hz): 10 mV/PaⳎ–40 dBV re. 1 V/Pa
Electrical impedance: 200 ohms
Recommended load impedance:  1000 ohms
Weighted sound pressure level acc.
to DIN 45405 (CCIR 468-2): 26 dB
Weighted sound pressure level acc.
to DIN 45412 (A-weighted): 17 dB-A
S/N ratio in ref. to 1 Pa (A-weighted): 77 dB
Max. sound pressure level: 80 PaⳎ132 dB SPL at 1000 Hz,
2000 ohms load imped. and 1 %
THD
250 PaⳎ142 dB SPL with 10 dB
pre-attenuation
Operating temperature range: –20° C to +60° C (–4° F to +140° F)
Acceptable humidity level: 99% at +20° C (68° F)
95% at +60° C (140° F)
Powering: 9–52 volts d.c. acc. to DIN 45596
Current consumption: 2mA
Outer dimensions: 19 mm  x 147 mm
(3/4  x 5.8 inch)
Net weight: approx. 115 g (4.1 oz)
Housing material: brass
Housing finish: matte-grey
Connector: 3 pin. XLR type
Connections: acc. to IEC
This product conforms to EN 50 082-1