Mecanum’s impedance and transmission tubes are specifically designed to measure the main acoustic indicators of a wide range of acoustical materials.


The method is based on ASTM E1050, ISO 10534-2 and ASTM E2611 standards.


Tube Models

100 mm

35 à 1800 Hz

29 mm

50 à 6600 Hz

44.44 mm

45 à 4300 Hz

100 mm

35 à 1800 Hz


4 microphones impedance tube

2 microphones impedance tube

29 mm

50 à 6600 Hz

44.44 mm

45 à 4300 Hz

100 mm

35 à 1800 Hz

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3 microphones impedance tube

29 mm

50 à 6600 Hz

44.44 mm

45 à 4300 Hz

Measured Properties





Standard Mecanum’s impedance and transmission tube system includes:

  • Impedance and transmission tube

  • Microphones

  • DAQ system

  • Ultralow distortion audio amplifier

  • TUBE-X software

  • A verification sample to check the measurement procedure

  • Grids to support limp materials

  • Rings to minimize acoustical leaks around the sample

TUBE-X Software


The TUBE-X software is a user-friendly tool for impedance tube measurements. It will allow you to choose among different measurement techniques. TUBE-X controls the entire procedure from calibration to the measurement itself. It takes into account the atmospheric conditions and the internal dissipation of the tube.

TUBE-X can also:

  • Measure in white noise or sweep sines

  • Correct the effects of grids and rings if they are used during measurement

  • Compare measurement projects

  • Merge the measurements made with the different tubes

  • Average measurements (in fine bands, third octave and octave)

  • Estimate acoustic indicators (NRC, SAA)

  • Calculate the penetration depth of the acoustic wave in the material (20 dB reduction)

  • Export graphs and data to Excel and text files

In addition, it is fully compatible with the FOAM-X software which allows non-acoustic parameters of porous materials to be extracted using the inverse method [JCAA2005, SAE2017, SAE2018] which uses absorption measurements obtained with 2, 3 or 4 microphones and the indirect method [JASA2006, JASA2008, AA2010] which uses measurements obtained with 3 or 4 microphones.

Comparison Tool

Main Advantages of the Product


Measurement method according to Standart Procedure


User-friendly interface


Measurement method from the scientific literature


Superior manufacturing quality




Anechoic Termination


Mecanum’s patent-pending Enhanced Noise Deadener (E.N.D.) Technology is simply the most compact and efficient anechoic termination on the market. Specially designed to be used with acoustic impedance and sound transmission tubes. Mecanum anechoic terminations are the only ones to reach 95% of sound absorption coefficients at 150 Hz in only 37 cm long. Mecanum END™ technology complies with the definition of an anechoic wall according to ISO 3745.


Mecanum anechoic terminations, based on END technology, are compact in comparison to existing absorbent terminations.


They exist in different diameters to fit acoustic tubes of:

  • 100 mm

  • 64.5 mm

  • 44.44 mm

  • 34.9 mm

  • 29 mm

  • Custom design on demand

Mecanum anechoic terminations are characterized by a cutoff frequency from which a sound absorption coefficient is maintained. Different terminations are available:

  • Cutoff frequency of 95% @ 150 Hz

  • Cutoff frequency of 95% @ 100 Hz

  • Cutoff frequency of 99% @ 100 Hz  (Anechoic termination according to ISO 3745)

  • Custom design on demand


Applications of Anechoic Termination

  • Use with an acoustic impedance tube

  • Use with a sound transmission tube

  • END™ Technology can also be used in different surface acoustic treatments

Main Adavantages of the Termination


Improved quality of the inter-microphone correction function of ASTM E1050, ASTM E2611 and ISO 10534 standards


Improved quality of sound absorption and sound transmission measurements in acoustic tubes


Used as absorbent acoustic load (anechoic) in the ASTM E2611 two-load method


Only tube termination that satisfies the anechoic conditions of ISO 3745 standard


Based on Mecanum’s patent-pending END™ Technology

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