MIL-DTL-5589E
3.1 First article. When specified (see 6.3), a sample shall be subjected to first article inspection
(see 6.3) in accordance with 4.4.
3.2 Material. Materials shall be used, which will enable the earphones to meet the performance
requirements of this specification. Acceptance or approval of any constituent material shall not be
construed as a guaranty of the acceptance of the finished product.
3.2.1 Case. Case material shall be of steel or other suitable magnetic shielding material, capable of
withstanding headband yoke pressure. The earphone shall have a black finish.
3.2.2 Insulating and impregnating compounds. All insulating and impregnating compounds applied
including varnishes, waxes and the like, shall be suitable for each particular application. Compounds
shall adequately preserve the dielectric strength of the insulation to which it is applied. The compound
used (either in the state of its original application or as a result of aging) shall not show any injurious
effect upon the insulation it is to protect, and shall not cause corrosion or deterioration of adjacent metal
or plastic parts.
3.2.3 Magnetic stability. The materials used in the magnetic circuit shall be processed and assembled
so that the earphone element will suffer no degradation in performance over long periods of use or
storage.
3.2.4 Cementing compounds. Any cementing compound used in the construction of the earphone
shall show no evidence of loosening nor have other detrimental effects.
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3.2.5 Fungus resistant. The manufacturer shall verify by certification that all materials for fabrication
of earphones covered by this specification are fungus resistant. The manufacturer may refer to MIL-
HDBK-454 Guideline 4 (Fungus-Inert Materials). When no certification is provided or nutrient materials
are used, the manufacturer shall test them prior to fabrication of the earphones as specified in 4.6.15.
There shall be no evidence of fungus growth on the external surfaces.
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3.2.6 Soldering. The materials and methods used for soldering shall conform to Class 2 of ANSI/IPC
J-STD-001.
3.3 Design. Earphones shall be designed in accordance with figure 1. Earphones shall be inherently
stable mechanically and acoustically.
3.3.1 Diaphragm. The earphone shall be constructed to have equalization of pressure on both sides
of the diaphragm when subjected to changes in ambient pressure as low as 3.4 inches (86.36 mm) of
mercury.
3.3.2 Weight. The weight of each earphone shall not be greater than 3.5 ounces.
3.3.2.1 Transformers. The use of a transformer in the earphone is permissible; however, when a
transformer is used it shall be inside the earphone case and included as part of the total weight.
3.3.3 Cap. The earphone cap shall be nonremovable.
3.3.4 Stay-cord anchor. At the option of the manufacturer, the earphone may be provided with a
nonferrous metal eye to permit anchoring of the tie or stay cord of the cordage, as shown on figure 1.
3.4 Performance characteristics.
3.4.1 Frequency response. When measured as specified in 4.6.2, the frequency response at 1,000
hertz (Hz) shall be between 106 decibels (dB) and 112 dB above a reference level of 0.0002 dyne per
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