3 Inch (77 mm), 4 Ohm Mini-Woofer

Brand Name
Oaktron by MISCO
Model #
Part #
In stock

A lightweight mini-woofer designed for a variety of indoor and outdoor audio applications, including gaming, music, and medical devices. This 4 ohm, 3 inch driver includes a 2.5 Oz neodymium ring magnet, a 0.8 inch aluminum voice coil, and a flat polypropylene cone with a rubber surround for moisture and environmental resistance.

  • Mini-woofer
  • 3 inch (77 mm) steel basket diameter
  • 20 watts, 4 ohms, 84 dB SPL
  • 0.8 inch aluminum voice coil, Kapton former
  • 2.5 Oz neodymium ring magnet
  • Flat polypropylene cone, rubber surround

MISCO engineers use the world's most sophisticated loudspeaker measurement systems, including the Klippel Analyzer, to maximize and validate the speaker's design, as well as the Klippel QC module to ensure perfect unit-to-unit consistency and reliability.   

Pair this woofer with one of our MISCO Amplifiers.

Download Product Specifications (PDF) »

More Information
Brand Name Oaktron by MISCO
Model # 77-MB04-01
Size, Nominal (inch & mm) 3" (77 mm)
Shape of Speaker Square
Speaker Type Woofer
Application Arcade Gaming, Casino Gaming
Environment Outdoor / Indoor
RoHS Compliant Yes
Nominal Impedance (Z) (Ω) 4
Rated Power IEC268-5 (W) 20 Watts
Rated Impedance (Ω) 4
Continuous Power (W) 20
Program Power (W) 40
Frequency Range (Hz) 125 - 20,000
Sensitivity (dB SPL) ¹ 84
Resonant Frequency (Fs) (Hz) +/- 15% 72
DC Resistance (Re) (Ω) 3.3
Voice Coil Inductance (Le) (mH) 0.48
Mechanical Q Factor (Qms) 5.51
Electrical Q Factor (Qes) 0.77
Total Q Factor (Qts) 0.67
Mechanical Resistance (Rms) (kg/s) 0.81
Compliance Equivalent Volume (Vas) (L) 0.60
Suspension Compliance (Cms) (mm/N) 0.50
Surface Area of Diaphragm (Sd) (cm²) 29.2
Moving Mass (Mms) (gm) 9.9
Magnetic Gap Height (mm) 4
Coil Winding Height (mm) 9.1
Maximum Linear Excursion (Xmax) (mm) 2.6
Motor Force Factor (BL) (T•M) 4.4
Efficiency (η₀) (%) 0.03
Efficiency Bandwidth Product (EBP) (Fs/Qes) 93.3
Basket Type Stamped steel, clear zinc plated
Terminal Size (mm) 5.2 x 0.5 mm
Voice Coil Diameter (mm) 19.3802
Voice Coil Wire Material Aluminum
Voice Coil Former Material Kapton
Voice Coil Winding 4 layer, round wire
Magnet Material Neodymium
Magnet Weight (g) 1.89
Cone Body Material Polypropylene
Cone Surround Material Natural rubber
Dust Cap Material Paper
Spider Material Cotton / polyester
Net Weight (kg) 0.25
Technical Notes

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