4" Paper Cone Foam Surround Woofer

The 4PF-8 features a poly-laminated paper cone and a pincushion frame, making it an ideal replacement speaker for Realistic (Radio Shack) Minimus 7, Acoustic Research SAT 660, some Koss models, and many others, both vintage and modern.

Product Details

Thanks to their carefully optimized parameters, the 4PF-8 4" poly-laminated paper cone woofers offer a high degree of compatibility when used as replacement speakers—they also provide excellent performance in new projects, too.

Quick Facts

  • Perfect for use in sealed-box home theater and music systems
  • Poly-laminated paper cone, treated foam surround, and polymer dust cap
  • Smooth frequency response with minimal cone breakup


Product Specifications

Nominal Diameter4"
Power Handling (RMS)40 Watts
Power Handling (max)70 Watts
Impedance8 ohms
Frequency Response100 to 10,000 Hz
Sensitivity84 dB 1W/1m
Voice Coil Diameter1"

Thiele-Small Parameters

Resonant Frequency (Fs)98 Hz
DC Resistance (Re)7.49 ohms
Voice Coil Inductance (Le)0.88 mH
Mechanical Q (Qms)4.55
Electromagnetic Q (Qes)1.9
Total Q (Qts)1.34
Compliance Equivalent Volume (Vas)0.12 ft.³
Maximum Linear Excursion (Xmax)2.5 mm

Materials of Construction

Cone MaterialTreated Paper
Magnet MaterialFerrite

Mounting Information

Overall Outside Diameter4.125"
Baffle Cutout Diameter3.75"
# Mounting Holes4

Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)

Sealed Volume0.09 ft.³
Sealed F3104 Hz
Vented Volume1.26 ft.³
Vented F353 Hz