C12K
| Nominal Overall Diameter | 307 mm | 12 in |
| Nominal Voice Coil Diameter | 50 mm | 2 in |
| Magnet Weight | 1450 g | 51 oz |
| Overall Weight | 4.3 kg | 9.48 lbs |
| Flux Density | 1.1 T | |
| Voice Coil Winding Depth | 10 mm | 0.39 in |
| Magnetic Gap Depth | 8 mm | 0.31 in |
| Nominal Impedance | 4Ω | 8Ω | 16Ω | |
|---|---|---|---|---|
| Voice Coil DC Resistance | RE | 3.25 Ω | 6.75 Ω | 12 Ω |
| Resonance Frequency | ƒS | 102 Hz | 115 Hz | 113.3 Hz |
| Mechanical Q Factor | QMS | 19.8 | 16.4 | 17.41 |
| Electrical Q Factor | QES | 0.90 | ||
| Total Q Factor | QTS | 0.52 | 0.82 | 0.86 |
| Mechanical Moving Mass | MMS | 34.9 g | 33.4 g | 35.6 g |
| Mechanical Compliance | CMS | 70 µm/N | 57 µm/N | 55 µm/N |
| Force Factor | BxL | 11.65 Wb/m | 13.7 Wb/m | 18.3 Wb/m |
| Equivalent Acoustic Volume | VAS | 23.6 lt. | 19.6 lt. | 19 lt. |
| Maximum Linear Displacement | XMAX | ± 1 mm | ± 1 mm | ± 1 mm |
| Reference Efficiency | nO | 4.47 % | 4.43 % | 3.89 % |
| Diaphragm Area | SD | 490.9 cm2 | 490.9 cm2 | 490.9 cm2 |
| Losses Electrical Resistance | RES | 120 Ω | 210 Ω | 360 Ω |
| Voice Coil Inductance @ 1kHz | LE | 0.61 mH | 0.84 mH | 1.36 mH |
| Magnet | Ferrite | |
| Voice Coil Winding | Copper | |
| Voice Coil Former | Kapton | |
| Cone Material | Paper | |
| Surround Material | Integrated Paper | |
| Dust Dome Material | Non-treated Cloth | |
| Basket Material | Pressed Sheet Steel | |
| Surround Treatment | Yes |
| Nominal Impedance | 4Ω | 8Ω | 16Ω | |
|---|---|---|---|---|
| Rated Power | 100 W | 100 W | 100 W | |
| Musical Power | 200 W | 200 W | 200 W | |
| Sensitivity@1W,1m | 99.4 dB | 99 dB | 99 dB |
While not strictly a vintage reissue, the C12K is the first design that Jensen developed in the early ‘90s. It is tonally inspired by the classic vintage ceramic Jensen, but with a substantially stronger voice, full bass and smooth top end. The C12K became one of the speakers of choice for Fender®, used in a myriad of world-selling models. Vintage tone with modern power handling and dynamics are the key virtues of the C12K.
We have used them with high gain sounds in our 2x12 Magma Xaman cabs, the tone is what we were looking for! Deep bass, warm mids and sweet highs, very balanced!
I actually ended up purchasing a pair of C12K's. I installed them in my Fender Twin and absolutely love the sound. I was looking for speakers that wouldn't break up quickly because I like to have a lot of headroom in order to get some jazz tone and also make good use of my effects pedals. These speakers fit the bill and if I ever need to replace them I'm sure I'd just buy another pair as long as they're available
I totally rebuilt a '72 Fender Twin and added a little lower end to it by installing some C12K's. Mostly I play a new Benedetto Benny and/or a '71 Les Paul thru it, and it rocks the house. Even the other "players" in the audience have to comment on the great "tone" I get. I love it, and being in 4 groups I use it 3 - 5 times a week.
