5
NOISE CRITERION CURVES
PLA-RP35EA.UK
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63
125
250
BAND CENTER FREQUENCIES, Hz
PLA-RP71EA.UK
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63
125
250
BAND CENTER FREQUENCIES, Hz
OCH626A
NOTCH SPL(dB)
LINE
High
31
Medium1
29
Medium2
28
Low
26
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
500
1000
2000
4000
8000
NOTCH SPL(dB)
LINE
High
34
Medium1
32
Medium2
30
Low
28
500
1000
2000
4000
8000
PLA-RP50EA.UK
PLA-RP60EA.UK
90
80
70
60
50
40
30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
10
63
125
PLA-RP100EA.UK
90
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
APPROXIMATE
20
THRESHOLD OF
HEARING FOR
CONTINUOUS
NC-20
NOISE
10
63
125
12
NOTCH SPL(dB)
High
32
Medium1
31
Medium2
29
Low
27
250
500
1000
2000
4000
BAND CENTER FREQUENCIES, Hz
NOTCH SPL(dB)
High
40
Medium1
37
Medium2
34
Low
31
250
500
1000
2000
4000
BAND CENTER FREQUENCIES, Hz
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000
LINE
NC-70
NC-60
NC-50
NC-40
NC-30
NC-20
8000