TestSens SoundTube

Sound Transmission Loss and Sound Absorption Coefficient Measurement Systems

TestSens Sound Tube performs compliant with ASTM E-2611, ASTM E-1050, ISO 10534-2 standards, enabling users to measure and calculate acoustic impedance, absorption coefficient, sound transmission loss and many more acoustical performance quantities. Product family consists of three different sized tubes with diameters of 29mm, 50mm and 100mm, offering a frequency range of 50-6400 Hz.


System Features

  • Compliance with ASTM E2611 (4-Pole Transfer Matrix Method)
  • Compliance with ASTM E1050 ve ISO 10534-2 (Transfer Function Method)
  • 50 - 6400 Hz measurement range
  • Specially designed phase-matched microphones
  • High inner surface tolerance
  • Acoustic leakage-proof construction


  • Determination of sound barrier properties (sound transmission loss, characteristic impedance, characteristic wave number)
  • Determination of sound absorbing properties (sound absorption coefficient, complex reflection coefficient, surface impedance)
  • Determination of dynamic density and dynamic bulk modulus
  • Determination of transfer matrix elements
  • Random incidence absorption estimation models
  • Tube attenuation removal algorithm for very low absorptive materials
  • Conical adapter correction for transmission loss measurements
  • Determination of intrinsic properties with Johnson-Champoux-Allard-Lafarge (JCAL) material model. (Porosity, Flow Resistivity, Tortuosity, Viscous Characteristic Length, Thermal Characteristic Length, Static Thermal Permeability)
  • Amplitude and phase calibration of microphones
  • Selectable frequency resolution and number of averages