MIL-DTL-9415B
3.4.1.9 Drainage. Each Dynamic Loudspeaker LS-184A/AIC-10 shall incorporate adequate drainage provisions
for any moisture condensing within the unit. When the complete assembly is mounted in any usable position,
including horizontal, oblique, vertical, overhead, and sidewise mounting, all closed corners, channels, etc, which
would collect and hold water, shall be eliminated or be provided with adequate means for drainage. A properly
located round hole of 0.125-inch (0.078 mm) diameter is considered satisfactory drainage for a corner in a sheet
metal box.
3.4.2 Performance.
3.4.2.1 Magnetic.
3.4.2.1.1 Stray magnetic field. Dynamic Loudspeaker LS-184A/AIC-10 shall not cause a deflection of more than 5
degrees on a magnetic compass when the loudspeaker is placed 18 inches away from the compass and oriented for
maximum compass deflection (see 4.5.2.3.1).
3.4.2.2 Electrical.
3.4.2.2.1 Voice coil polarity. When a direct-current potential of between 1.5 and 6 volts is applied to the voice-coil
terminals so that the cone of the loudspeaker moves in a direction away from the magnetic assembly, the terminals of
the connector and the terminals of the terminal board that are connected to the battery positive terminal shall be
distinctively identified in red. The red markings shall not interfere with the electrical connections and shall not be
impaired by soldering or unsoldering operations (see 4.5.2.1.1).
3.4.2.2.2 Voice coil impedance. The impedance of the voice coil shall be between 6 and 8 ohms when measured
at the lowest impedance found at a frequency higher than the fundamental resonance of the loudspeaker, and shall
be less than 12 ohms at 4000 cycles per second (Hz). The frequency at which fundamental resonance occurs shall
be below 400 Hz (see 4.5.2.1.2).
3.4.2.2.3 Impedance variation. There shall be no change in the impedance of the voice coil as a result of any or
all of the service-condition tests (see 4.5.3).
3.4.2.2.4 Power handling capacity. The loudspeaker shall be capable of handling, continuously, signal inputs of
4.5 volts without damage.
3.4.2.2.5 Operation. Dynamic Loudspeaker LS-184A/AIC-10 shall provide satisfactory performance and shall not
adversely affect the performance of any other component of Intercommunication Set AN/AIC-10A when
interconnected with, and operated as a part of that equipment.
3.4.2.3 Acoustical.
3.4.2.3.1 Sensitivity. The average sensitivity of the loudspeaker above a reference level of 20 µPa (micropascals)
for each of the indicated frequency bands, measured in accordance with the procedure specified herein, shall be not
TABLE I. Sensitivity.
Frequency Band (Hz)
Average Sensitivity (dB)
320 500
96.0
500 800
93.5
800 1,250
94.5
1,250 2,000
97.0
2,000 3,200
97.5
3,200 5,000
96.5
5,000 6,000
95.5
320 1,250
95.0
1,250 6,000
97.0
320 6,000
96.0
6
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