MIL-DTL-12606E
2.4 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific
exemption has been obtained.
3. REQUIREMENTS
3.1 Qualification. Loudspeakers furnished under this specification shall be products which are qualified for listing on the applicable
Qualified Products List (QPL) before contract award (see 4.5 and 6.3).
3.2 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material shall be used
which will enable the loudspeaker 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 Metals.
3.2.1.1 Aluminum. Aluminum shall conform to composition 13 of QQ-A-591.
3.2.1.2 Copper. Copper shall conform to QQ-C-576.
3.2.1.3 Dissimilar metals. There shall be no intermetallic contact of dissimilar metals. Where it is necessary that any combination of
dissimilar metals be assembled, an interposing material shall be used which is compatible to each metal. Compatibility of intermetallic
contacting surfaces is defined in MIL-F-14072.
3.2.2 Solder. Solder shall conform to composition Sn60 of QQ-S-571.
3.2.3 Wire. Magnet wire shall conform to NEMA-MW1000, MW-15-C.
3.2.4 Screws. Screws shall conform to FF-S-92.
3.3 Design and construction. The loudspeaker shall be of the design, construction, and physical dimensions specified herein (see
figures 1, 2, and 3).
3.3.1 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28. Where practical, all threads shall conform with
the coarse-thread series. The fine-thread series shall be used only for applications that might show a definite advantage through their
use. Where a special diameter-pitch combination is required, the thread shall be of American National Form and of any pitch between 16
and 36 which is used in the fine-thread series.
3.3.2 Finishes. Finishes shall be in accordance with MIL-F-14072, type 1 (exposed). Final color shall be No. 24084 (olive drab)
conforming to FED-STD-595. Aluminum alloy baskets may be chemical conversion film per MIL-C-5541, exposure 1, alodine per MIL-F-
14072.
3.3.3 Adhesives. Water soluble adhesives shall not be used.
3.3.4 Terminal board. The terminal board for the voice coil wire lead terminations shall be made of laminated plastic sheet conforming
to L-P-513 and shall provide two solder-type terminals to permit the soldering to two No. 24 AWG wires on each terminal. Terminals shall
be copper or copper-base alloy and shall be solder coated.
3.3.4.1 Terminal board marking. The terminal board shall have a distinctive red mark adjacent to one terminal which shall be visible
with the terminal board mounted in place (see figure 1).
3.3.5 Moisture- and fungus-resistant treatment. Parts that are not fungus resistant shall be treated in accordance with MIL-T-152.
3.4 Performance requirements.
3.4.1 Voice coil polarity. When tested as specified in 4.7.2, the voice coil shall move in a direction away from the magnet.
3.4.2 Voice coil impedance. When tested as specified in 4.7.3, the voice coil impedance shall be 8 ±1 ohms.
3.4.3 Dielectric withstanding voltage. When tested as specified in 4.7.4, there shall be no arcing or breakdown of the voice coil
insulation.
3.4.4 Acoustic quality. When loudspeakers are tested as specified in 4.7.5, there shall be no buzzes, rattles, or other spurious
sounds that would impair the quality of reproduced audio signal in the output.
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