5.25" (133 mm) 4 Ohm, Premium Woofer

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This Oaktron Woofer was designed for high quality home audio music systems and is a great solution for bookshelf design systems. Its robust die cast aluminum basket supports a talc-filled polypropylene cone with a natural rubber surround.

  • Black powder coated, die-cast aluminum basket structure
  • Large dust cap and solid copper winding voice coil assembly
  • 100 Watts, program power
  • Half-roll molded NBR rubber surround
  • Talc-filled, polypropylene cone body
  • Large HE (High Energy) Ferrite magnet

MISCO engineers test and analyze the performance of these speakers, using world's most sophisticated loudspeaker measurement systems including Klippel Analyzer and Klippel QC, which are used to validate final design.  Oaktron by MISCO is the premium line of high performance, ready-to-ship transducers for a wide variety of applications including high fidelity, musical instrument, automotive and many more. From elegantly simple to highly specialized designs for unique and demanding applications, there is an Oaktron loudspeaker perfectly suited for your needs.

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More Information
Model # 133-WF04-01
Height 4.0000
Width 6.0000
Length 6.0000
Size, Nominal (inch & mm) 5.25" (133 mm)
Shape of Speaker Square
Speaker Type Woofer
Application High-End Audio and Home Theater, Home Audio, Pro Sound
Environment Indoor
RoHS Compliant Yes
Nominal Impedance (Z) (Ω) 4
Rated Power IEC268-5 (W) 50 Watts
Rated impedance (Ω) 4
Power, Continuous (W) 50
Power, Program (W) 100
Frequency range (Hz) 38 - 9,400
Sensitivity (dB SPL) ¹ 87
Resonant Frequency (Fs) (Hz) 51
DC resistance (Re) (Ω) 3.5
Voice Coil Inductance (Le) (mH) 0.36
Mechanical Q factor (Qms) 5.43
Electrical Q Factor (Qes) 0.51
Total Q factor (Qts) 0.47
Mechanical Resistance (Rms) (kg/s) 0.64
Compliance equivalent volume (Vas) (L) 9.88
Suspension Compliance (Cms) (mm/N) 0.90
Surface area of diaphragm (Sd) (cm²) 88.25
Moving mass (Mms) (gm) 10.67
Motor Force Factor (BL) (T•M) 4.8
Efficiency (η₀) (%) 0.25
Efficiency Bandwidth Product (EBP) (Fs/Qes) 100.78
Basket type Die cast aluminum with black powder coat
Terminal size 6.4 x 0.8 mm / 4.7 x 0.5 mm
Voice coil diameter (mm) 25.8
Voice coil wire material Copper clad aluminum
Voice coil former material Polyimide film (kapton)
Voice Coil Winding Single coil, two layer
Magnet Material Ferrite
Magnet weight (gm) 568
Cone body material Talc filled, polypropylene
Cone surround material Molded NBR
Dust cap material Talc filled, polypropylene
Spider Material Conex
Net weight (kg) 1.23
Technical Notes

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