IBMB - Institut für Baustoffe, Massivbau und Brandschutz der Technischen Universitet
Braunschweig - Germany

Test facilities for walls

Transmitting room dimensions:
lenght 5.9 m width 4.6 m height 2.5 m
Receiving room dimensions:
lenght 4.7 m width 4.6 m height 2.5 m
Trasmitting room volume:  68 m3
Receiving room volume:  54 m3
Test opening dimensions:
width 4.52 m height 2.57 m
Border of the niche
to fix the specimens in:		 CONCRETE
Noise generator: NORSONIC 823
Loudspeakers positions: FIXED
Microphones type: ON STANDS
Diffusing elements:  
Number of microphones
positions: 		 6
Number of source positions:  2 (3 below 100 Hz)


Maximum achievable Sound Reduction Index (Rmax):

100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 Hz
42.6 52.5 53.1 60.2 57 60.4 64.6 68.1 69.3 72.7 75.2 78.8 81.2 80.3 79.2 77.2     dB

Rwmax = 69 dB

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