Measurement of sound absorption coefficient

Measurement of sound absorption coefficient

February 23, 2004
P400541-A
Enclosure 08
Measurement of sound absorption coefficient
Test
Client
Object
Date of test
Conditions
Result
Measurement of sound absorption coefficient in a reverberation room
according to SS-EN 20354 (ISO 354).
Ecophon AB
Chirster Persson
Focus E, Access E
Thickness: 20 mm.
Panel size: 600 mm x 600 mm.
February 12, 2004
Mounting depth:
200 mm.
Surface area:
10,8 m2.
Room volume:
200 m3.
Temperature at measurement on object/in empty room:
19/ 18 °C.
Relative humidity at measurement on object/in empty room: 83/ 82 %.
Sound absorption class A according to EN ISO 11654.
Weighted sound absorption coefficient αw = 0,9 according to EN ISO 11654.
Practical sound absorption coefficient
1,2
1,0
0,8
0,6
0,4
0,2
0,0
63
125
250
500
1000
2000
4000
Frequency (Hz)
SP Swedish National Testing and Research Institute
Acoustics
Hans Jonasson
Technical Manager
Mohammad Jalalian
Technical Officer
Frequency
(Hz)
αp
63
125
250
500
1000
2000
4000
0,15
0,45
0,80
0,90
0,85
0,95
0,90