The Building Test Centre
British Gypsum Ltd
Leicestershire - Great Britain

Test facilities for walls

Transmitting room dimensions:
lenght 4.9 m width 5.94 m height 3.45 m Not rectangular
Receiving room dimensions:
lenght 4.28 m width 4.26 m height 3.09 m Not rectangular
Trasmitting room volume:  98 m3
Receiving room volume:  62 m3
Test opening dimensions:
width 3.6 m height 2.4 m
Border of the niche
to fix the specimens in:		 WOOD
Noise generator: NORSONIC 830 Real Time Analyzer
Loudspeakers positions: MOVING
Microphones type: ROTATING
Diffusing elements: area 6.59 m2
Number of microphones
positions: 		 1
Number of source positions:  1


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
53 57 61 60 63 68 71 78 84 90 94 97 97 99 96 96 97 93 dB

Rwmax = 76 dB

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