Full-Range 8" Speaker Pioneer Type B20FU20-51FW

Designed as a replacement for the beloved Pioneer B20FU20-51FW, the 8FR-8 is a shining example of "bang for your buck." It meets or surpasses the parameters of the "BOFU," as it was sometimes called, and excels in workaday applications, as well as full range hi-fi duty.

Product Details

Our 8FR-8 full-range 8" speaker features a paper cone with poly foam surround. A whizzer cone extends high frequency response and dispersion. Engineered to withstand rigorous commercial use, this driver will also deliver great results when used in point-source hi-fi applications. Affordable pricing makes it perfect for DIY applications. Ideal replacement for the Pioneer B20FU20-51FW (also known in DIY communities as the BOFU)

Quick Facts

  • Replacement for Pioneer B20FU20-51FW
  • GRS quality construction
  • 1 year warranty
  • Superb multipurpose speaker for DIY projects


Product Specifications

Nominal Diameter8"
Power Handling (RMS)60 Watts
Power Handling (max)85 Watts
Impedance8 ohms
Frequency Response39 to 16,000 Hz
Sensitivity91 dB 1W/1m
Voice Coil Diameter1.5"

Thiele-Small Parameters

Resonant Frequency (Fs)39 Hz
DC Resistance (Re)7.02 ohms
Voice Coil Inductance (Le)1.28 mH
Mechanical Q (Qms)2.94
Electromagnetic Q (Qes)0.46
Total Q (Qts)0.4
Compliance Equivalent Volume (Vas)2.26 ft.³
Maximum Linear Excursion (Xmax)3 mm

Materials of Construction

Cone MaterialPaper
Magnet MaterialFerrite

Mounting Information

Overall Outside Diameter8"
Baffle Cutout Diameter7.25"
# Mounting Holes4

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

Sealed Volume0.71 ft.³
Sealed F378 Hz
Vented Volume1.76 ft.³
Vented F343 Hz