U, M12606-01 and M12606-02, unencased, permanent magnet loudspeakers with a 2-watt normal \(4-watt peak\) input. These loudspeakers are fungus-, and immersion-resistant, and have a voice coil impedance of 8 ?? 1 ohms. The cone and spider are made of polyamide-based phenolic material \(see 6.1\).

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MIL-DTL-12606E

c. Step 7b � not Applicable.

d. Final measurements � At the completion of the tenth cycle and following a 24 hour �1 hour period at 25 �5�C and 50 �5

percent relative humidity, the loudspeaker shall be tested for frequency response and harmonic distortion in accordance with

4.7.6 and 4.7.7, respectively, and examined for loose or deformed parts or other damage.

4.7.13 Bounce (see 3.4.12). The loudspeaker shall be mounted on a suitable fixture, without shock mounts, and placed on the table of

the package tester as made by the L.A.B. Corporation, Skaneateles, New York (or equal). The fixture shall be constrained from horizontal

motion of more than speed by suitable wooden fences. The package tester, shafts in phase, shall be operated at a speed of 285 +3

revolutions per minute, for a total of 3 hours �15 minutes. The fixture shall be placed on a different side for each one-half hour of test. At

the completion of the test, the loudspeaker shall be tested for frequency response and harmonic distortion in accordance with 4.7.6 and

4.7.7, respectively, and examined for loose or deformed parts or other damage.

4.7.14 Shock (see 3.4.13). A total of nine blows shall be applied to the loudspeaker employing the shock testing machine for

lightweight equipment, in accordance with MIL-S-901. Three blows shall be applied parallel to each of three principle axes of the

loudspeaker. The three blows for each direction are to be with a height of a hammer drop of 1 ft. (30.48 cm), 3 ft. (91.44 cm),

and 5 ft (152.40 cm), respectively.

5. PACKAGING

5.1 Packaging requirements. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see

6.2). When actual packaging of material is to be performed by DoD personnel, these personnel need to contact the responsible

packaging activity to ascertain requisite packaging requirements. Packaging requirements are maintained by the Inventory Control Point's

packaging activity within the Military department or Defense Agency, or within the Military Department's System Command. Packaging

data retrieval is available from the managing Military Department's or Defense Agency's automated packaging files, CD-ROM products, or

by contacting the responsible packaging activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. This loudspeaker is primarily intended to be used as part of loudspeakers specified in MIL-L-12632. The

loudspeakers covered by this specification are military unique, because they must be able to withstand water immersion for 24 hours and

ambient temperatures ranging from �80�F +160�F. Commercial loudspeakers are not designed to withstand such extreme environmental

conditions and would experience catastrophic failure.