Hz
Absorption Coefficient
125
1.17
160
1.02
200
1.08
250
1.09
315
1.00
400
1.01
500
0.94
630
0.93
800
0.92
1000
0.93
1250
0.95
1600
0.96
2000
0.95
2500
0.99
3150
0.97
4000
0.98
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