Sources | VVS

Mid-High Frequency Volume Velocity Source

MidHighMonopole PNCA3 Click to enlarge

The mid-high frequency monopole of Microflown Technologies is an omni-directional volume velocity sound source. The sound source has a high dB particle velocity reference sensor to measure accurate the output of the source. The frequency range covered by this source is from 300Hz up to 7kHz. For most applications like panel noise contribution analysis this is sufficient. The lower frequency is limited by the source diameter. If lower frequencies are required, a low frequency monopole is also developed covering a bandwidth of 30Hz up to 300Hz. The sound power output of a monopole source is proportional with the frequency squared. To be able to reach relative high sound pressure at low frequencies with an acceptable source velocity one needs to increase the source diameter. For an omni-directional behavior however, the diameter should be small compared to the wavelength. The mid-high frequency monopole has a inner tube diameter of 15mm.

The Mid-high frequency monopole is delivered as complete system including needed accessories such as a amplifier, cabling etc.





  • Panel Noise Contribution Analysis
  • SMT Substitution Monopole Technique
  • In-situ transmission loss measurements
  • General airborne and structure borne transfer functions
  • Scan & Paint TPA


  • Cabin Interior Panel Noise Contribution Analysis
  • In-situ transmission loss measurements