5.25" (133 mm) Neo-Rite "Work-Horse" Woofer

Brand Name
Oaktron by MISCO
Model #
Part #
In stock

The 5-1/4” woofer format is one of the most popular ever made. Our Oaktron version can handle 100 Watts of program power. The design incorporates durable black powder coat and a stamped steel frame, which supports a Neo-rite magnet: a large 12 oz ferrite magnet with added 1 oz neodymium focus magnet for extra flux density.  The T-yoke includes an optimized vented pole for thermal management. The voice coil is copper wire wound on a high temperature polyimide film form. This is also an excellent choice for numerous music applications. With convenient 4 hole mounting, this speaker is front or rear mountable. Look at these features:

  • 100 watt maximum power handling
  • A Neo-rite magnet assembly: Large (HE) 12 ferrite magnet + 1 oz neodymium field focusing magnet
  • Vented Pole for optimal thermal management
  • High temperature 1" voice coil
  • Talc filled polypropylene cone body
  • Oversized talc filled polypropylene dome dust cap

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 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.

 *This speaker does have an overhang surround and therefore grille placement cannot be flush to the speaker gasket. It is a front or rear panel mountable woofer. 

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More Information
Brand Name Oaktron by MISCO
Model # 133-WF04-01
Height 4.0000
Width 6.0000
Length 6.0000
Size, Nominal (inch & mm) 5.25" (133 mm)
Shape of Speaker Round
Speaker Type Woofer
Application Auto / Motorcycle, Casino Gaming, Home Audio
Environment Outdoor / 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) 40 - 7,500
Sensitivity (dB SPL) ¹ 87
Resonant Frequency (Fs) (Hz) 56
DC resistance (Re) (Ω) 3.3
Voice Coil Inductance (Le) (mH) 0.35
Mechanical Q factor (Qms) 11.74
Electrical Q Factor (Qes) 0.56
Total Q factor (Qts) 0.53
Mechanical Resistance (Rms) (kg/s) 0.56
Compliance equivalent volume (Vas) (L) 4.59
Suspension Compliance (Cms) (mm/N) 0.43
Surface area of diaphragm (Sd) (cm²) 86.59
Moving mass (Mms) (gm) 18.46
Magnetic Gap Height (mm) 4.5
Coil winding height (mm) 12.2
Maximum linear excursion (Xmax) (mm) 3.8
Motor Force Factor (BL) (T•M) 6.3
Efficiency (η₀) (%) 0.14
Efficiency Bandwidth Product (EBP) (Fs/Qes) 101.08
Basket type Stamped steel with black powder coat
Terminal size 2.8 x 0.5 mm / 4.7 x 0.5 mm
Voice coil diameter (mm) 25.8
Voice coil wire material Copper
Voice coil former material Aluminum
Voice Coil Winding 2 layer, single coil
Magnet Material Neodymium/Ferrite
Magnet weight (gm) 12 oz ferrite + 1 oz neodymium
Cone body material Mica filled polypropylene
Cone surround material Santoprene
Dust cap material Mica filled polypropylene
Spider Material Woven cloth
Net weight (kg) 0.96
Technical Notes

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