Condenser Microphone Type 4179 and Microphone Preamplifier Type 2660 constitute a unique system for measuring sound pressures well below the nominal 0dB re 20 μPa reference level for acoustic measurements. The 1/3-octave bandwidth inherent noise floor of the complete system at 1 kHz is typically -16dB.

USE SCENARIOS

  • Hearing research
  • Monitoring of very low background noise levels
  • Sound power measurement of very-low-level sources
  • Distanced measurement of very-low-level compressor, fan or motor noise where close measurements

FEATURES

  • Very low inherent noise floor of -2,5dB (A) . (-7 to -16dB in the '/s-octave bands 20 Hz to 20 kHz)
  • High sensitivity: 1 V/Pa
  • Frequency response in accordance with IEC 651, Type 1 
Diameter
1/2 and 1/1
Optimised for
Low-noise
Connector at instrument/cable
B&K, 7-pin
Polarization voltage support
Yes
Supply voltage
± 6 and ± 60
Max output voltage (peak)
45
Max output current (peak)
1.5
Frequency range
20 to 200000
Attenuation
< 0.06
Noise A-weighted, typical
0.8
Noise 22,4 Hz to 300 kHz, typical
5
Input impedance
36||0.3