C8R





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 |
Nominal Impedance | 4Ω | 8Ω | |
---|---|---|---|
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 |
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 |
Nominal Impedance | 4Ω | 8Ω | |
---|---|---|---|
Rated Power | 25 W | 25 W | |
Musical Power | 50 W | 50 W | |
Sensitivity@1W,1m | 94.4 dB | 93 dB |
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.
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.
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.
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.