Speaker - Jensen® Vintage Alnico, 8", P8R, 25W

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Speaker - Jensen® Vintage Alnico, 8", P8R, 25W

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One of the archetypical speakers in the range, the P8R has been installed in thousands of Champ and Princeton style amps for decades. Slightly clearer sounding than the C8R, its ceramic cousin, the P8R shines in clean and slightly crunch applications, where the typical chime of the AlNiCo magnets helps the sparkling harmonics to bloom.

Guitarist Description: Warm clean tone with emphasis on the highs. Responds to overdrive distortion with a warm and bright fuzz lead voice.

  • Lows: Loose
  • Mids: Subdued
  • Highs: Bright
  • Overdrive: Smooth

For more information about our Jensen® speakers, see our tech corner article on Jensen Speakers.

RoHS Compliant
Item ID:
JensenJensen VintageAlnico
Part Numbers
ImpedanceOur Part NumberUPC/EAN
4 ΩP-A-P8R-48034028640063
8 ΩP-A-P8R-88034028640056
Product Measurements
Basket MaterialPressed Sheet Steel
Cone MaterialPaper
Depth4.1141 in.
Diameter8 in.
Diaphragm Area (SD)213.80 cm2
Dust Dome MaterialSolid Paper
Equivalent Acoustic Volume (VAS)4 Ω version10.50
8 Ω version10.30 liters
Flux Density0.96 T
Force Factor (BxL)4 Ω version3.72 Wb/m
8 Ω version3.99 Wb/m
Inner Diameter7.0275 in.
Linear Displacement, maximum (XMAX)1.00 mm
Losses Electrical Resistance (RES)4 Ω version16.00 Ω
8 Ω version27.00 Ω
Magnet Assembly Depth1.9488 in.
Magnet TypeAlnico
Magnetic Gap Depth6.00 mm
Mechanical Compliance (CMS)4 Ω version164.00 µm/N
8 Ω version159.00 µm/N
Mechanical Moving Mass (MMS)4 Ω version9.30 g
8 Ω version8.80 g
Mechanical Q Factor (QMS)8.67
Mounting Hole Bolt Circle Diameter7.7559 in.
Mounting Hole Diameter0.1968 in.
Musical Power50.00 W
Nominal Overall Diameter207.00 mm
Nominal Voice Coil Diameter25.00 mm
Outer Diameter8.1496 in.
Rated Power25.00 W
Reference Efficiency (nO)4 Ω version1.27 %
8 Ω version0.95 %
Resonance Frequency (ƒS)4 Ω version129.00 Hz
8 Ω version135.00 Hz
Sensitivity @ 1W, 1m4 Ω version94.10 dB
8 Ω version91.80 dB
Surround MaterialIntegrated Paper
Surround TreatmentYes
Total Q Factor (QTS)4 Ω version1.43
8 Ω version2.28
Voice Coil DC Resistance (Re)4 Ω version3.00 Ω
8 Ω version6.60 Ω
Voice Coil Diameter1 in.
Voice Coil FormerEpotex
Voice Coil Inductance @ 1 kHZ (LE)4 Ω version0.21 mH
8 Ω version0.36 mH
Voice Coil Winding Depth4.00 mm
Voice Coil Winding TypeCopper
Packaging Information
Packaging Dimensions9.1 in. × 9.1 in. × 6 in.
Weight (Packaging)3.1 lbs.

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Specifications, Files, and Documents

Sound Samples:

PDF: Specification Sheet Specification Sheet173.77 KB
PNG: Terminal Dimensions Terminal Dimensions21.21 KB

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Product Reviews

5.00 out of 5 based on 1 reviews
- February 10th, 2010
5 out of 5

While sorting through a bunch of junk at a Tucson thrift store I came across an older Fender Champ. It was like finding buried treasure until I looked at the cone - it was disintegrated. I almost did not buy it, but did anyway. While looking for replacement speakers online I found the P8R recommended and ordered one from Amplified Parts as a well as a new production JJ 6V6 vacuum tube. This amp now sounds fantastic!

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