Sound reduction of panels and walls using small‐scale models

The ability to make sound reduction and transmission loss measurements on small‐scale wall models is an attractive proposition for R&D work. Using the impulse response technology offered by the Grozier GTS‐800 acoustical measurement system, measurements of insertion loss were made on single free‐standing panels at normal incidence and at 45 deg. In the range 4 to 40 kHz, the results were in good agreement with mass law theory. Additional measurements of a wall between two $18‐scale$ offices also showed characteristics similar to full‐scale walls, but in the range 1 to 40 kHz.