General Characteristics
Nominal Overall Diameter 207 mm 8 in
Nominal Voice Coil Diameter 25 mm 0.98 in
Magnet Weight 270 g 10 oz
Overall Weight 1 kg 2.2 lbs
Flux Density 1 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 6.73 Ω
Resonance Frequency ƒS 131 Hz 126 Hz
Mechanical Q Factor QMS 9.65 10.29
Electrical Q Factor QES 2.18
Total Q Factor QTS 1.42 1.8
Mechanical Moving Mass MMS 9.2 g 9 g
Mechanical Compliance CMS 161 µm/N 176 µm/N
Force Factor BxL 3.76 Wb/m 4.7 Wb/m
Equivalent Acoustic Volume VAS 10.3 lt. 11.4 lt.
Maximum Linear Displacement XMAX ± 1 mm ± 1 mm
Reference Efficiency nO 1.34 % 1.03 %
Diaphragm Area SD 213.8 cm2 213.8 cm2
Losses Electrical Resistance RES 19 Ω 37 Ω
Voice Coil Inductance @ 1kHz LE 0.22 mH 0.43 mH
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Copper
Voice Coil Former Kapton
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 94.4 dB 93 dB
25 watts
Available in 4Ω, 8Ω

The C8R is the little gem in the Jensen Vintage series. It delivers a solid compact tone that defies its size. Extremely versatile, it finds application in small home and student amplifiers; but with a microphone in front, it is capable of transferring on tape some of the biggest tones ever. Not by chance, the vintage Fender® Champ® amplifiers produced with the C8R speaker are treasured by many players as a great studio tool.

Guitarist Description
Crystal clear tone with brightly shining highs. Responds to overdrive distortion with a bright fuzz lead voice.
Specification Sheet
Product Dimensions
Note: all dimensions are in mm.
User Reviews

I changed the speaker in my small amp Fender LT25. To my ear I got much more pleasant lows, I can finally hear mids, and highs are still good. Now my amp is much better and it is much easier to hear the difference when I adjust basic parameters on the front panel. It can also be heard more clearly when I turn on/off compressor :) Very happy.


I used two of these speakers (8 ohm in parallel) in a clone of the Magnatone Melodier 109 that I built. They turned out to be a perfect match for the self-split push-pull circuit. They have a rich sound when played clean, and they handle the output-tube distortion that the amp produces beautifully. Absolutely perfect for blues. And the price is right! My go-to 8" speaker.

Jason Thorpe

Sounded great in a 1973 Bronco I installed it in.


I was a little hesitant that this speaker would work for my unique application. I'm not using it for a guitar amp but as a replacement speaker for a 1948 AM/FM/Phono radio that the original 10" speaker was missing. It turns out this speaker works great. I went with the 8" version instead of a bigger one to get a greater frequency range and am glad I did.

This thing rocks even though the tube amp is only putting out 5w.

Chad Beebe

I did purchase a C8R 4ohm speaker to use with my kit amp: The speaker is a good match for this amp and has considerable volume capabilities.

James in Mequon, WI