MIL-DTL-24223D(SH)
3.14.4 Sound pressure distribution. When tested as specified in 4.5.6.2, the loudspeaker shall produce the
minimum off-axis sound pressure shown in the specification sheet relative to the on-axis sound pressure measured to
conform to 3.14.3 for the 800 to 1,250 Hertz (Hz) warble band, at the distance and angle shown in the specification
sheet.
3.14.5 Frequency response. When measured as specified in 4.5.6.3, the frequency response characteristic shall
fall within the limits identified in the specification sheet. However, peaks and dips may extend beyond these limits,
provided the width at the limit line is not greater than 2/10 octave, and that there is not more than one such excursion
in any octave interval. Microphone placement for this test shall be as specified in 4.5.6.
3.14.6 Operation at increased input. The loudspeaker shall be capable of meeting the power input, sound
pressure output, and frequency response performance requirements specified when tested in accordance with
3.14.7 Operation at reduced output. The sound pressure output shall be within 1.0 dB of indicated levels with
reference to the output when tapped at "FULL", when tested in accordance with 4.5.6.5 with the transformer
secondary tapped at -6 dB, -12 dB, -18 dB, and -24 dB. Types not requiring volume control (3.11) are excluded
from this requirement.
3.15 Dielectric strength. There shall be no evidence of malfunction when tested in accordance with 4.5.3.
Speakers shall withstand a 900 Root Mean Square (RMS) voltage applied between one voice coil terminal and
surrounding metal parts.
3.16 Immersion. After being subjected to the immersion test specified in 4.5.7, the loudspeaker performance
shall meet the requirements of 3.14.1.
3.17 Endurance. Loudspeakers shall be capable of meeting the quality of reproduction, sound pressure output,
and frequency response performance requirements specified in 3.14.1, 3.14.3, and 3.14.5 after being subjected to the
endurance test specified in 4.5.8.
3.18 Temperature. The operating temperature requirements are as specified in the specification sheets, and
shall be tested in accordance with 4.5.10. The storage temperature requirements are -40 to 186.8 °F (-40 to 86 °C)
when tested in accordance with 4.5.10.
3.19 Salt spray. The loudspeaker shall be capable of withstanding the salt spray test specified in 4.5.11 without
evidence of physical damage or corrosion. Following the salt spray test, the loudspeaker performance shall meet the
requirements of 3.22.
3.20 Vibration. The loudspeaker shall be capable of withstanding the vibration test of 4.5.12 without evidence
of physical damage. Loudspeaker performance following the test shall conform to 3.22.
3.21 Shock. The loudspeaker shall be capable of meeting the performance requirements of 3.22 after being
subjected to the shock test specified in 4.5.13.
3.22 Acoustic performance after salt spray, vibration, and shock tests. Following the salt spray test (3.19),
vibration test (3.20), and shock test (3.21), the loudspeaker shall be subjected to the sound pressure output
requirements identified in the specification sheets, tested in accordance with 4.5.6.1 and 4.5.2, and meet the quality
of reproduction requirements of 3.14.1. The sound pressure output levels shall be within 2 dB of the original values
measured before the environmental tests.
3.23 Stray magnetic field (LS-530()/SIC, LS-531()/SIC, LS-535()/SIC, and LS-536()/SIC). Some loudspeakers
have maximum stray magnetic field requirements. When required (refer to specification sheets), loudspeaker shall
be tested in accordance with 4.5.14.
3.24 Resistance to jet blast and gun blast. When required (see specification sheets), the loudspeaker shall be
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