PUT TO THE HERTZ AND DECIBEL TEST.
This includes sonic fabric testing under optimum conditions, testing of various frequencies (vibrations per minute) and frequency ranges (1/3 octave and octave) as well as echo chamber tests used to compare the acoustic function of the textiles. The rate of sonic absorption is depicted on a numerical scale from 0 to 1, 1 means 100 % absorption, 0.7 means 70 % absorption. The rate of sonic Absorption is then divided into absorption classes from A to E, where A is the top class. Opaque fabrics are in the absorption classes from A to C, whereas transparent fabrics are from D to E.
BOTH AUDIBLY AND VISUALLY ASTOUNDING.
An overview of the Zimmer + Rohde product performance curve: