MIL-DTL-9415B
TABLE IV. Frequency distortion.
Signal Input
Frequency Range (Hz)
2.65 volts 4.5 volts
200 500
7%
8.5%
500 6,000
3-1/2%
4.0%
3.4.2.3.8 Acoustic quality. There shall be no buzzes, rattles, or other spurious sounds in the acoustic output of the
loudspeaker during the acoustic quality test specified herein (see 4.5.2.1.5).
3.4.2.3.9 Ruggedness. The loudspeaker shall be capable of continuous or intermittent operation with a signal
input of 4.5 volts at 400 Hz for an operating time of 50 hours without producing rattles or appreciable variation in
fidelity, or causing deleterious effects to the windings of the voice coil or any other part of the loudspeaker. There
shall be no change in the sensitivity and response-frequency characteristic of the loudspeaker after the 50-hour
operation (see 4.5.2.1.6).
3.4.2.3.10 Overall performance. With a 4-volt (rms) input signal, the acoustic output of the complete assembly
over the frequency range of 200 Hz to 10,000 Hz shall be free of buzzes, rattles, and other spurious sounds, and
shall have a sound pressure level of approximately 93 dB, relative to 20 µPa, measured in a free field at a point on
the principal axis 3 feet away from the complete assembly (see 4.5.2.3.2).
3.4.3 Service conditions. Dynamic Loudspeaker LS-184A/AIC-10 shall be so designed and constructed that after
being subjected to the environmental and mechanical service condition tests specified herein, no part shall crack,
warp, deteriorate, or become dimensionally unstable; no fixed part or assembly shall become loose; no moving or
movable part or assembly shall become undesirable free or sluggish in operation; and no degradation shall be
caused in the performance below that required by this specification (see 4.5.3).
3.5 Audio frequency amplifier AM-492B/AIC-10.
3.5.1 Performance in "normal" condition.
3.5.1.1 Gain (normal). The bridging gain of the amplifier, measured at 1,000 Hz and below the overload point,
shall be 7.5 dB ± 1.5 dB (see 4.5.2.2.2).
3.5.1.2 Frequency response (normal). The frequency response of the amplifier shall be within the limits specified
TABLE V. Frequency response.
Frequency (Hz)
Relative Output in dB
300
+2, -2
500
+1, -2
1,000
0
2,000
+1, -2
4,000
+1, -2
5,000
+1, -2
6,000
+1, -2
10,000
+2, -10
3.5.1.3 Distortion (normal). The total harmonic distortion present in the output of the amplifier at 400 Hz shall not
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