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MIL-DTL-25547 Loudspeaker, Permanent Magnet Ls-211/Aic-13This specification covers one type of loudspeaker, designated loudspeaker, permanent magnet, LS-211/AIC-13. This loudspeaker is a horn type unit with a frequency response of 200-7,000 Hz, nominal 16 ohms voice coil impedance, and a 20 watt peak power output \(see 6.1\).

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MIL-DTL-25547C
3.20 Explosive decompression. When tested as specified in 4.6.18, the loudspeakers shall meet the following
requirements:
a. Voice coil impedance variation: Not more than 1 ohm maximum from the initial measured value, except when
measurements are made immediately after hot and cold exposures of the last cycle (see 3.4).
b. Sensitivity variation: Not more than ±2 dB from the initial measured value (see 3.7.1).
c. Frequency response: As specified in 3.8.
d. Dielectric withstanding voltage: As specified in 3.13.
e. Visual examination: There shall be no visual or mechanical failures (see table VIII).
3.21 Humidity. When tested as specified in 4.6.19, loudspeakers shall meet the following requirements:
a. Voice coil impedance variation: Not more than 1 ohm maximum from the initial measured value, except when
measurements are made immediately after hot and cold exposures of the last cycle (see 3.4).
b. Sensitivity variation: Not more than ±2 dB from the initial measured value (see 3.7.1).
c. Frequency response: As specified in 3.8.
d. Dielectric withstanding voltage: As specified in 3.13.
e. Visual examination: There shall be no visual or mechanical failures (see table VIII).
3.22 Fungus. When tested as specified in 4.6.20, loudspeaker shall meet the following requirements:
a. Voice coil impedance variation: Not more than 1 ohm maximum from the initial measured value, except when
measurements are made immediately after hot and cold exposures of the last cycle (see 3.4).
b. Sensitivity variation: Not more than ±2 dB from the initial measured value (see 3.7.1).
c. Frequency response: As specified in 3.8.
d. Dielectric withstanding voltage: As specified in 3.13.
e. Visual examination: There shall be no visual or mechanical failures (see table VIII).
3.23 Salt fog. When tested as specified in 4.6.21, loudspeakers shall meet the following requirements:
a. Voice coil impedance variation: Not more than 1 ohm maximum from the initial measured value, except when
measurements are made immediately after hot and cold exposures of the last cycle (see 3.4).
b. Sensitivity variation: Not more than ±2 dB from the initial measured value (see 3.7.1).
c. Frequency response: As specified in 3.8.
d. Dielectric withstanding voltage: As specified in 3.13.
e. Visual examination: There shall be no visual or mechanical failures (see table VIII).
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