4" Mil-Spec, Voice Communication Speaker

Brand Name
Oaktron by MISCO
Model #
Part #
In stock

The LS445/U is now available for customers looking for individual packaging. This ruggedized voice-range speaker was designed for TOUGH DUTY military communications.

  • Die cast aluminum design
  • NSN 5965-008-923665
  • Built & tested; IAW MIL-DTL-12606
  • Phenolic impregnated cone and dust cap
  • Meta-aramid laminate, voice coil form
  • Includes separate rubber gasket and steel front screen

Meeting and Exceeding MIL Specs, this speaker is designed to work in communication panels and can be surface or rear mounted. Its copolymer phenolic resins create an extremely stable and tough cone surface. A meta-aramid laminate form supports the voice coil. This rare laminate material is known to be one of the most heat resistant materials made today. A powder-coated aluminum basket is its frame. This combination of design elements can withstand the bumps and jumps of a combat tank and even the constant vibration of a C-5M Super Galaxy military transport in flight.  

Download Product Specifications (PDF) »

More Information
Brand Name Oaktron by MISCO
Model # LS445/U
Size, Nominal (inch & mm) 4" (100 mm)
Shape of Speaker Square
Speaker Type Voice
Application Military, Outdoor , Signal / Alarm Systems, Voice Communications
Environment Outdoor / Indoor
RoHS Compliant No
Nominal Impedance (Z) (Ω) 8
Rated Power IEC268-5 (W) 2 Watts
Rated Impedance (Ω) 8
Program Power (W) 2
Frequency Range (Hz) 300 - 7,000
Sensitivity (dB SPL) ¹ 91
Resonant Frequency (Fs) (Hz) +/- 15% 590
DC Resistance (Re) (Ω) 7.0
Voice Coil Inductance (Le) (mH) 0
Total Q Factor (Qts) 0.83
Basket Type Cast aluminum
Terminal Size (mm) 0.152" x 0.025"
Voice Coil Diameter (mm) 0.73" / 18.5mm
Voice Coil Wire Material Copper
Voice Coil Former Material Meta-aramid laminate
Voice Coil Winding Single Layer
Magnet Material Barium ferrite
Magnet Weight (g) 156
Cone Body Material Cloth impregnated with phenolic resin
Cone Surround Material Cloth impregnated with phenolic resin
Dust Cap Material Cloth impregnated with phenolic resin
Spider Material Cloth impregnated with phenolic resin
Net Weight (kg) 0.56
Technical Notes

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