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USB Infrasound Microphone

WS2F - IEC 61094-4

The 1/2”  infrasound microphone capsule is designed for acoustic measurements in research, development and industry and is also used in building acoustics and audiology, among other things.

  • Frequency range 1 Hz to 20 kHz
  • free field
  • Sound pressure level up to 146 dB
  • 15 dBA to 146 dB
  • pre-polarized 

The microphone capsule has a fixed charge carrier layer (backelectret) to provide the polarization voltage.

The careful construction and the constructive concept of the microphone capsules guarantee a high temporal constancy of the electro-acoustic parameters.

The internationally common thread type (60 UNS) for connecting the microphone capsule allows interchangeability with other 1/2” microphone capsules and enables connection to all suitable calibration and measuring devices.


Ultrasonic USB Microphone

The iSV1611 digital USB microphone preamplifier is suitable for all common pre-polarized 1/2” microphone capsules.

The thread type 60 UNS allows the combination of different microphone capsule manufacturers depending on the application.

Class 1 Infrasound Microphone
USB Infrasound Microphone

Specifications of the infrasonic microphone capsule

IEC 61094-4 Type WS2F
Frequency Range
0.5 Hz ~ 20 kHz (±2 dB)
Responce Type
Free field
Electrode Forming Voltage
0 V
Sensitivity (dB re 20 μPa)
50mV/Pa (±1.5dB)
Capacitance at 250 Hz
18 pF
Maximum Sound Pressure Level
146 dB
Intrinsinc Noise Level
15 dB (A)
Operating Temperature Range
10℃~+ 50℃
Operating Humidity Range
up to 70 °C, 90 %
Temperature Characteristics
< 0.015 dB/°C
Humidity Characteristics
0.001 %(RH)
Aging Drift
0.2 dB/Year
Storage Temperature Range
-20 °C ~ +60 °C
Storage Humidity Range
25 % ~ 90 %(RH)
rear vented
Outer Dimensions
Ф 13.2 mm x 10.9 mm
8.3 gram

1/2" USB MicrophonePreamplifier

USB Microphone
Signal Amplitude ref. 50mV @ 1kHz
Frequency Response
Frequency Sampling 192 kHz
1 Hz~20Hz, Error <3.0dB
20 Hz~20kHz, Error<0.3dB
20 kHz~80kHz, Error<3dB
Electrical signal
noise background
Ch.1 (<13dBA, <26dBZ)
Ch.2 (<50dBA, <63dBZ)
THD Input 1kHz, 50mV, A weighting
Overload Indicator
1kHz (THD<3%)
Ch.1 (>101.9dB)
Ch.2 (>140dB)
Amplitude accuracy
Input 31.6mV, 1kHz, 90.0dB
Error <0.2dB
1/2″ Outer diameter
of protector cover
Ф 20 × 165 mm
φ 13.2mm
<96 g (cable not included)
Operating Temperature
-20°C ~ + 60°C
25 %~ 90 %(RH)
Atmospheric Pressure
65 kPa~108 kPa
Connector Type
Microphone Thread
11.7 mm-60 UNS