4" (100 mm), 4 Ohm Water-Resistant Voice Range Speaker

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A classic Oaktron 4 ohm 4" voice range speaker that provides ideal sound for mass transit audio systems and aerospace cabins. With a moisture repellent cone treatment, this driver is capable of withstanding a variety of hazards within indoor environments while still delivering 91 dB efficiency and 20 watt power handling.

  • Voice range speaker
  • 4" (100 mm) aluminum basket driver
  • 20 watts, 4 ohm, 91 dB SPL
  • 0.75" copper voice coil, aluminum former
  • Ferrite magnet, molded paper cone
  • Moisture repellent treatment

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More Information
Brand Name MISCO OEM
Speaker Type Voice
Shape of Speaker Square
Size, Nominal (inch & mm) 4" (100 mm)
Environment Indoor
Application Aerospace, Transit, Voice Communications
RoHS Compliant No
Rated Impedance (Ω) 4
Rated Power IEC268-5 (W) 20 Watts
Program Power (W) 20
Sensitivity (dB SPL) ¹ 91
Frequency Range (Hz) 300 - 6,000
DC Resistance (Re) (Ω) 3.6
Resonant Frequency (Fs) (Hz) 400
Nominal Impedance (Z) (Ω) 4
Mechanical Q Factor (Qms) 5.79
Electrical Q Factor (Qes) 3.65
Total Q Factor (Qts) 2.24
Basket Type Steel
Terminal Size (mm) 4.8 x 0.5
Voice Coil Diameter (mm) 19.3
Voice Coil Wire Material Copper
Voice Coil Former Material Aluminum
Magnet Material Ferrite
Magnet Weight (g) 85
Cone Body Material Molded paper fiber
Cone Surround Material Molded paper fiber
Dust Cap Material Molded paper fiber
Net Weight (kg) 0.3
Technical Notes

¹ Sensitivity is measured with 2.83 volt input, measured on-axis at 1 meter distance