MIL-PRF-25670/2C
+10
ALIGN 1000 Hz Response
with 0 dB reference
+5
0
-5
20 dB per Octave
-10
3500 5000
400
1000
100
Frequency in Hz
FIGURE 4.
25,000 ft. frequency response envelope for earphone element H-143/AIC.
+10
+5
10 dB
6 dB
0
-5
-10
2000
100
500
5000
1000
200
Frequency in Hz
C FIGURE 5. Ground-level frequency response for earphone element, immersible, H-143A/AIC.
3