4 Inch (100 mm) 8 Ohm, Compact Woofer

Brand Name
Oaktron by MISCO
Model #
Part #
In stock

The 93075 is a low-profile, lightweight, flame-retardant woofer designed for sealed or vented enclosures within a high-end aerospace audio system. It's also ideal in compact enclosures like bookshelf speakers or other home audio projects.

  • Woofer
  • 4 inch (100 mm) cast aluminum basket diameter
  • 20 watts, 8 ohm, 82 dB SPL
  • 1 inch copper voice coil, polyimide former
  • 8.9 Oz neodymium magnet
  • Aluminum dome cone, flame retardant rubber surround

MISCO engineers test and analyze the performance of these speakers using the world's most sophisticated loudspeaker measurement systems, including the Klippel Analyzer and the Klippel QC, which confirm the final design.  

Pair this woofer with one of our MISCO Amplifiers.

Download Product Specifications (PDF) »

More Information
Brand Name Oaktron by MISCO
Model # 100-WF08-01
Size, Nominal (inch & mm) 4" (100 mm)
Shape of Speaker Square
Speaker Type Woofer
Application Aerospace, Home Audio, Indoor
Environment Indoor
RoHS Compliant Yes
Nominal Impedance (Z) (Ω) 8
Rated Power IEC268-5 (W) 20 Watts
Rated Impedance (Ω) 8
Continuous Power (W) 20
Program Power (W) 30
Frequency Range (Hz) 52 - 20,000
Sensitivity (dB SPL) ¹ 82
Resonant Frequency (Fs) (Hz) +/- 15% 75
DC Resistance (Re) (Ω) 6.2
Voice Coil Inductance (Le) (mH) 0.37
Mechanical Q Factor (Qms) 4.83
Electrical Q Factor (Qes) 1.18
Total Q Factor (Qts) 0.95
Mechanical Resistance (Rms) (kg/s) 0.70
Compliance Equivalent Volume (Vas) (L) 2.48
Suspension Compliance (Cms) (mm/N) 0.63
Surface Area of Diaphragm (Sd) (cm²) 52.8
Moving Mass (Mms) (gm) 7.1
Motor Force Factor (BL) (T•M) 4.2
Efficiency (η₀) (%) 0.09
Efficiency Bandwidth Product (EBP) (Fs/Qes) 63.7
Basket Type Cast aluminum
Terminal Size (mm) 6.4 x 0.5 / 7.1 x 0.5
Voice Coil Diameter (mm) 25.4
Voice Coil Wire Material Aluminum
Voice Coil Former Material Polyimide film
Voice Coil Winding Single Layer
Magnet Material Neodymium
Magnet Weight (g) 22.67
Cone Body Material Aluminum
Cone Surround Material Flame retardant treated rubber
Dust Cap Material Aluminum
Net Weight (kg) 0.23
Technical Notes

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