Low Frequency VVS

The low frequency volume velocity source is an omni-directional sound source which behaves like a acoustic monopole with controlled source strength. The sound source has a particle velocity sensor mounted at the end of the duct to accurately measure its broadbanded acoustic output. The frequency range covered by this source goes from 30 Hz up to 500 Hz. A power amplifier is supplied with this volume velocity source.




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This omni-directional noise source is equipped with a Microflown particle velocity sensor on the tip of its nozzle, being the only source capable of directly measuring the radiated volume velocity for a broad frequency range with unparalleled accuracy. The source is capable of generating high excitation levels in order to properly excite the sound field under study.

Features include:

  • Frequency range 30 Hz – 500 Hz
  • High power output: max. Sound Power of 122 dB
  • Direct volume velocity measurement
  • Integrated particle velocity sensor
  • Fast reciprocal transfer function acquisition


  • Acoustic Transfer Functions
  • Panel Noise Contribution Analysis
  • Transfer path analysis
  • Airborne source quantification
  • Component vibroacoustic behaviour characterisation
Frequency range30 – 500 Hz
Sound power level122 dB re 1 pW
Sound pressure level @1 m111 dB re 20 uPa
Maximum input signal (RMS)40 V
Driver impedance8 Ohms
Height44.5 cm
Nozzle∅ 15 cm
Casing∅ 33 cm
Weight11.8 kg


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