19
OCH728A
PLFY-M20VEM-(E/ET)
PLFY-M25VEM-(E/ET)
NOTCH SPL(dB)
LINE
High
29
Medium1
27
Medium2
26
Low
24
PLFY-M32VEM-(E/ET)
PLFY-M40VEM-(E/ET)
PLFY-M50VEM-(E/ET)
NOTCH SPL(dB) LINE
High
31
Medium1
29
Medium2
27
Low
26
PLFY-M63VEM-(E/ET)
NOTCH SPL(dB)
LINE
High
32
Medium1
30
Medium2
29
Low
28
PLFY-M80VEM-(E/ET)
NOTCH SPL(dB)
LINE
High
37
Medium1
34
Medium2
31
Low
28
PLFY-M100VEM-(E/ET)
NOTCH SPL(dB)
LINE
High
41
Medium1
39
Medium2
37
Low
34
PLFY-M125VEM-(E/ET)
NOTCH SPL(dB)
LINE
High
45
Medium1
42
Medium2
39
Low
35
90
80
70
60
50
40
30
20
10
63
125
250
500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
AVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
90
80
70
60
50
40
30
20
10
63
125
250
500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
AVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
90
80
70
60
50
40
30
20
10
63
125
250
500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
AVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
90
80
70
60
50
40
30
20
10
63
125
250
500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
AVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
90
80
70
60
50
40
30
20
10
63
125
250
500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
AVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
90
80
70
60
50
40
30
20
10
63
125
250
500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
AVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 μbar)
BAND CENTER FREQUENCIES, Hz
3-4. NC CURVES