Maico MA 33 - Page 79

Operation Manual MA 33
8100092 Rev. 9
77
19/08/2019
6.2 Calibration Values and Maximum Levels
6.2.1 Calibration Values and Maximum Levels – Air Conduction
Calibration values and Max Levels: Headphone DD45
Coupler IEC 60318-3, Force 4-5 N, PTB-DTU Report 2009-2010
Frequency
[Hz]
Tone
RETSPL
dB re 20µPa
NBN RETSPL
dB re 20µPa
Max Tone
[dB HL]
Max NBN
[dB HL]
SOUND
ATTENUA-
TION [dB]
ISO 4869-1
125
47.5
51.5
70
60
3
250
27.0
31.0
90
80
5
500
13.0
17.0
100
95
7
750
6.5
11.5
105
100
-
1000
6.0
12.0
105
100
15
1500
8.0
14.0
105
100
-
2000
8.0
14.0
105
100
26
3000
8.0
14.0
105
100
-
4000
9.0
14.0
105
100
32
6000
20.5
25.5
95
90
-
8000
12.0
17.0
90
90
24
Signal
IEC 60645-1
RETSPL
IEC Max Level
[dB HL]
ANSI S3.6
RETSPL
ANSI Max
Level [dB HL]
Speech
20.0
90.0
18.5
90.0
Speech Noise
20.0
90.0
18.5
90.0