MIL-PRF-25670/1B
REQUIREMENTS
Dimensions and configuration: See figure 1.
Maximum weight: 3 ounces.
Color and finish: Normally exposed surface shall be semi gloss yellow #23538, in accordance with
FED-STD-595.
Face: A coupler of rubber cellular latex shall be mounted on the face of the earphone element
surrounding the sound aperture and shall be as specified on figure 3.
Inches
mm
NOTES:
.06
1.52
1. Dimensions are in inches.
.50
12.70
2. Unless otherwise specified, tolerance is ± .03 inches.
.75
19.05
3. Metric equivalents are given for information only.
1.56
39.62
FIGURE 3. Earphone with coupler.
Nominal coil clearance: .012 inch (0.30 mm) minimum.
Stray magnetic fields: 5° maximum, with earphone at 8 inches (203.2 mm) distance from compass.
Frequency response: At ground level and with the limits specified on figure 2, the response above
4,500 Hz should drop off as rapidly as practicable.
Sensitivity: 100 ± 3 dB, above 20 µPa at 1,000 Hz and ground level.
Impedance: 22.5 ± 3 ohms at 1,000 Hz. Between 100 and 3,000 Hz, impedance shall not differ by
more than 0.5 ohm from the 1,000 Hz value.
3
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