General Characteristics
Nominal Overall Diameter 207 mm 8 in
Nominal Voice Coil Diameter 25 mm 0.98 in
Magnet Weight 200 g 7 oz
Overall Weight 1.2 kg 2.65 lbs
Flux Density 0.96 T
Voice Coil Winding Depth 4 mm 0.16 in
Magnetic Gap Depth 6 mm 0.24 in
Thiele-Small Parameters
Nominal Impedance
Voice Coil DC Resistance RE 3 Ω 6.6 Ω
Resonance Frequency ƒS 129 Hz 135 Hz
Mechanical Q Factor QMS 8.67 8.67
Electrical Q Factor QES 3.09
Total Q Factor QTS 1.43 2.28
Mechanical Moving Mass MMS 9.3 g 8.8 g
Mechanical Compliance CMS 164 µm/N 159 µm/N
Force Factor BxL 3.72 Wb/m 3.99 Wb/m
Equivalent Acoustic Volume VAS 10.5 lt. 10.3 lt.
Maximum Linear Displacement XMAX ± 1 mm ± 1 mm
Reference Efficiency nO 1.27 % 0.95 %
Diaphragm Area SD 213.8 cm2 213.8 cm2
Losses Electrical Resistance RES 16 Ω 27 Ω
Voice Coil Inductance @ 1kHz LE 0.21 mH 0.36 mH
Constructive Characteristics
Magnet Alnico
Voice Coil Winding Copper
Voice Coil Former Epotex
Cone Material Paper
Surround Material Integrated Paper
Dust Dome Material Solid Paper
Basket Material Pressed Sheet Steel
Surround Treatment Yes
Electrical Characteristics
Nominal Impedance
Rated Power 25 W 25 W
Musical Power 50 W 50 W
Sensitivity@1W,1m 94.1 dB 91.8 dB
25 watts
Available in 4Ω, 8Ω

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.
Specification Sheet
Product Dimensions
Note: all dimensions are in mm.
User Reviews

After being disappointed by lots of dull and flat sounding speakers universally praised as true '50s and '60s Jensens replicas, I've put a Jensen C12Q RI on my self-made Deluxe Reverb and I've finally started hearing what I was expecting - sparkling, chime, incredible touch response, strong attack and gritty 3D overdrive. It was immediately followed by a P12R on my Tweed Deluxe and a P8R on Tweed Champ, with great satisfaction. Everything you read around on forums, about how new Jensens sound nothing like the old ones, is pure bull from deaf people: if you crave authentic vintage Fender sound, this is it.


Great replacement for the original Phillips in the silver face Vibro Champ. Late Breakup lets the tubes get into saturation while still having good touch sensitivity. Nice tone without modifying the amp.

David Thompson

Picked up a White model 80 amp at a swapmeet, it had tubes in the wrong sockets and a junky no-name modern speaker. Didn't know quite what it was at the time, but figured anything made in Fullerton might have a Fender link. I replaced the filter caps (saving the old ones) and installed tubes from my NOS stash. The final touch was ordering a Jensen P8R speaker. It's a great-sounding amp for harp, lap steel, and my Oscar Schmidt electric dobro.

Walt in California

The P8R is the bee's knees. I replaced the thing in the Bugera BC-15 with the P8R and I am one happy camper.

Ross Barkley

Found a Champ for five bucks at a garage sale that was pretty beat up. I did a complete cap job, put in a JJ 6V6 and a Jensen P8R. This amp now sounds fantastic.

Ben in Indianapolis, IN