Impedance tubes, dynamic stiffness and airflow resistivity benches, benchtop chambers. Characterising a material in house instead of sending every batch to an external laboratory.
Repeatable samples on dense materials (rubber, felt, EPDM).
Testing microphones, small sources and fans.
Random-incidence absorption on small samples, without a 200 m3 room.
A crooked cut is the leading cause of wrong measurements.
Underlay manufacturers pay an external laboratory for every batch.
Not just absorption: transmission loss and transfer matrix of the material.
Alpha, impedance, TL, export for FEM/BEM solvers.
Extension of the family already in the catalogue.
Impact-sound underlays: the figure the designer needs and cannot find today.
Characterising porous materials for prediction models.
Normal-incidence absorption and impedance on small samples.
Those who make them sell to laboratories, not to practices. Below that threshold the market is there to be created.
An input parameter for Johnson-Champoux-Allard models.
The two boundary conditions the standard asks for.
Two laboratories compared on the same sealed specimen.
The edge of the sample decides the result: here it is standardised.
The effect of the air gap behind the material, without improvised spacers.
Check that the tube tells the truth before believing it.
Panels, glass, membranes: indicative TL without two coupled chambers.
Samples cut with a knife rather than a punch.
Floor and ceiling measurements without holding it by hand.
The hardest parameter to source in Italy.
Universities and technical institutes: the standing wave becomes visible.
50 Hz to 6.4 kHz coverage with one purchase and one piece of software.