Maico MA 28 - Page 48

Operation Manual MA 28
8506915 Rev. 5
47
05/05/2021
Calibration values: High Frequency Headphone DD450
Coupler IEC 60318-1
FREQUENCY
[HZ]
TONE
IEC 60318-1
RETSPL DB
RE 20µPA
NBN
IEC 60318-1
RETSPL DB
RE 20µPA
TONE
MAX
LEVEL
[DB HL]
NBN
MAX
LEVEL
[DB HL]
SOUND
ATTENUA-
TION [DB]
ISO 4869-1
125
30.5
34.5
95
70
15
250
18.0
22.0
105
85
16
500
11.0
15.0
110
90
23
750
6.0
11.0
110
95
-
1000
5.5
11.5
110
95
29
1500
5.5
11.5
110
95
-
2000
4.5
10.5
110
95
32
3000
2.5
8.5
110
95
-
4000
9.5
14.5
110
95
46
6000
17.0
22.0
100
85
-
8000
17.5
22.5
100
85
44
White Noise
-
0.0
-
110
-
Table provides max levels for PSE power only. USB power results in reduced max
levels.
Calibration values: Bone conductor Radioear B71 / B81
Coupler IEC 60318-6, mastoid placement
FREQUENCY
[HZ]
REFERENCE EQUIVALENT
THRESHOLD
FORCE LEVEL FOR TONE
AIR
RADIATION
MAX LEVEL
ISO 389 – 3 / ANSI S3.6
[DB] (RE 1µN)
MIN/MAX
[DB]
TONE
[DB HL]
250
67.0
-
45
500
58.0
-
65
750
48.5
-
70
1000
42.5
-
70
1500
36.5
-
70
2000
31.0
-
75
3000
30.0
80
80
4000
35.5
-
80
6000
40.0
50
50
8000
40.0
-
40
Table provides max levels for PSE power only. USB power results in reduced max levels.