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Ultrasound Microphones

Electret Ultrasound Microphone (Avisoft Bioacoustics / Emkay)
The Avisoft Bioacoustics electret ultrasound microphone is a cost-effective model, that employs an electret capsule by Emkay (Knowles). It is available either with a single-ended output and 5V power supply or balanced output and phantom feeding (P48). It is durable (no need to replace diaphragms) and is also relatively immune against humidity.
  • Frequency range : 500 Hz - 75/150 kHz
  • Output Impedance : 1000 ohm
  • Input-referred Self-Noise Level : 30 dB SPL (A-weighted) *
  • Feeding : Phantom feeding P48 (12...60V / 2 mA)
    or
    5 +- 0.5 V / 10 mA (UltraSoundGate specific model)
  • Connector : XLR-3
  • Diameter : 19 mm
  • Length : 47 mm
  • Weight : 30 g
 Electret Ultrasound Microphone

Frequency response Emkay
Frequency Response


Condenser Ultrasound Microphone SENNHEISER MKH800 P48
www.sennheiserusa.comfor more details.
The SENNHEISER condenser microphone MKH 800 P48 is a high-quality audio microphone with an extended frequency range. It employs a special high-frequency oscillator to ensure low-noise operation and a very good immunity against humidity. It requires a phantom feeding voltage of 48 +-4 V, that is supplied by the UltraSoundGate 116 P48 and UltraSoundGate 124 P48. This microphone could also be used for high-quality recordings in the low-frequency audio range (e.g. bird song recording).
  • Frequency range : 30 Hz - 80/200 kHz (the manufacturer specifies an upper corner frequency of only 50 kHz)
  • Output Impedance : 150 ohm
  • Input-referred Self-Noise Level : 10 dB SPL (A-weighted) *
  • Feeding : Phantom feeding P48 (48 +- 4V / 3 mA)
  • Connector : XLR-3
  • Diameter : 26.5 mm
  • Length : 179 mm
  • Weight : 135 g
See 		SENNHEISER MKH800 P48

Frequency response MKH 800
Frequency Response (omnidirectional pick-up pattern)

* Unfortunately, noise measurements are available in A-weighted format only. Due to the decreasing sensitivity towards higher frequencies, these measurements do not exactly apply to the ultrasonic domain.

Thanks to the high dynamic range of the UltraSoundGate devices (12 or 16 bit instead of 8 bit), it is possible to compensate the microphone frequency responses in the digital domain by software (e.g. Avisoft-SASLab Pro).


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Last modified on 17 March 2003, Raimund Specht