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MIL-PRF-25670-2 Earphone Element, High- And Low-Altitude, H-143/Aic, And Low-Altitude, Water-Immersible, H-143A/Aic

Pages 1 - 2 - 3 - 4 - 5


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MIL-PRF-25670/2C
+10
ALIGN 1000 Hz Response
with 0 dB reference
+5
0
-5
-10
1000
100
210
500
2500 5000
Frequency in Hz
FIGURE 2. Ground level frequency response envelope for earphone element H-143/AIC.
Ground Level
5 dB
25,000 ft
35,000 ft
100
1000
500
2500
5000
Frequency in Hz
FIGURE 3. Typical pressure frequency characteristics for earphone element H-143/AIC.
2



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