The plate has the same technical quality as the normal ones but is B-Selected because of dirt or other visual signs.
Frequency in HZ
absorption-value
100
0,37
125
0,47
160
0,75
200
0,78
250
0,99
315
0,94
400
1,10
500
630
1,08
800
1,03
1000
1,04
1250
1600
2000
2500
1,06
3150
1,05
4000
5000
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