PTB - Physikalisch-Technische Bundesanstalt
Braunschweig - Germany

Test facilities for walls

Transmitting room dimensions:

lenght 5.09 m

width 3.79 m

height 3.0 m

Receiving room dimensions:

lenght 4.69 m

width 3.79 m

height 3.0 m

Trasmitting room volume:

57.9 m³

Receiving room volume:

53.3 m³

Test opening dimensions:

width 3.48 m

height 2.8 m

Border of the niche
to fix the specimens in:

CONCRETE

Noise generator:

NORSONIC RTA 840

Loudspeakers positions:

MOVING

Microphones type:

ROTATING

Diffusing elements:

Number of microphones
positions:

2 circles

Number of source positions:

2

Maximum achievable Sound Reduction Index (R_max):

100	125	160	200	250	315	400	500	630	800	1000	1250	1600	2000	2500	3150	4000	5000	Hz
38	42	47	51	55	58	64	67	70	74	78	82	84	84	86	88	89	92	dB

R_w^max = 65 dB

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