MIL-DTL-25547C
TABLE III. Distortion.
Frequency
Signal input
range
3.9 volts
8.8 volts
Percent
Percent
Hz
14
9
500 - 1,000
5
3.5
1,000 - 6,000
3.12 Acoustic quality. When loudspeakers are tested as specified in 4.6.10, there shall be no buzzes, rattles, or
other spurious sounds that would impair the quality of reproduced audio signal in the output.
3.13 Dielectric withstanding voltage. When tested as specified in 4.6.11, there shall be no arcing or breakdown of
the voice coil insulation. Following the test, the loudspeaker shall meet the following requirements:
Voice coil impedance variation: Not more than 1 ohm maximum from the initial measured value.
3.14 Life. When tested as specified in 4.6.12, 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).
3.15 Endurance. When tested as specified in 4.6.13, 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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