1060 Rue Cherbourg, Sherbrooke, J1K2N8, Canada

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Impedance tube (2 mic)

Impedance tube for absorption

Mecanum’s 2 microphones impedance tubes are specifically designed to measure the main normal indicators of a wide range of acoustical materials. The method is based on ASTM E1050 and ISO 10534-2 standards.


**Large spacing between µ1 and µ2 is essential for better results at low frequencies (as stated in ASTM E1050)​



➡ Normal incidence sound absorption coefficient (α)

➡ Normal incidence complex reflection coefficient (R)

➡ Normal surface impedance (Zs)



Tube Internal Diameter Frequency Range High SPL Option
29 mm  200-6600 Hz Available
44.44 mm 100-4300 Hz N/A
 100 mm 35-1900 Hz N/A


Tube-X is a user-friendly software that will simplify the measurement procedure. It’s also fully compatible with Foam-X software that can extract non-acoustic parameters of porous materials using the inverse method with a 2 microphones absorption measurement.


  • All Mecanum impedance tubes are delivered with grids (for low mechanical strength samples) and rings (to avoid leaks).
  • Different accessories can be combined with impedance tubes depending on your needs.
  • All Mecanum’s 2 microphones impedance tubes can be upgraded to 3 or 4 microphones, contact your Mecanum product expert for details.