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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
3.16 Temperature cycling. When tested as specified in 4.6.14, the 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 ±3 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).
3.17 Vibration. When tested as specified in 4.6.15, 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.
3.18 Shock. When tested as specified in 4.6.16, 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.
3.19 Pressure cycling. When tested as specified in 4.6.17, 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.
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