Speaker - Jensen® Vintage Ceramic, 12", C12K, 100W

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Speaker - Jensen® Vintage Ceramic, 12", C12K, 100W

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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.

Guitarist Description: A real workhorse, heavy on the mids with a solid, straightforward tone. Presented with overdrive distortion it powers through with lows that are bold and heavy.

  • Lows: Tight
  • Mids: Aggressive
  • Highs: Subtle
  • Overdrive: Edgy/Crunchy

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

RoHS Compliant
Item ID:
JensenJensen VintageCeramic
Part Numbers
ImpedanceOur Part NumberUPC/EANJensen Part Number
16 ΩP-A-C12K-168034028640285 ZJ06021
4 ΩP-A-C12K-48034028640261 ZJ06021
8 ΩP-A-C12K-88034028640278 ZJ06021
Product Measurements
Basket MaterialPressed Sheet Steel
Cone MaterialPaper
Depth5.2362 in.
Diameter12 in.
Diaphragm Area (SD)490.90 cm2
Dust Dome MaterialNon-treated Cloth
Equivalent Acoustic Volume (VAS)4 Ω version23.60 liters
8 Ω version24.10 liters
16 Ω version26.0 liters
Flux Density1.10 T
Force Factor (BxL)4 Ω version11.65 Wb/m
8 Ω version14.00 Wb/m
16 Ω version17.70 Wb/m
Inner Diameter10.9055 in.
Linear Displacement, maximum (XMAX)1.00 mm
Losses Electrical Resistance (RES)4 Ω version120.00 Ω
8 Ω version210.00 Ω
16 Ω version360.00 Ω
Magnet Assembly Depth1.3779 in.
Magnet Assembly Diameter6.1023 in.
Magnet TypeFerrite
Magnetic Gap Depth8.00 mm
Mechanical Compliance (CMS)4 Ω version70.00 µm/N
8 Ω version71.00 µm/N
16 Ω version77.00 µm/N
Mechanical Moving Mass (MMS)4 Ω version34.90 g
8 Ω version31.90 g
16 Ω version29.30 g
Mechanical Q Factor (QMS)4 Ω version19.80
8 Ω version12.57
16 Ω version22.37
Mounting Hole Bolt Circle Diameter11.5551 in.
Mounting Hole Diameter0.2559 in.
Musical Power200.00 W
Nominal Overall Diameter307.00 mm
Nominal Voice Coil Diameter50.00 mm
Outer Diameter12.0866 in.
Rated Power100.00 W
Reference Efficiency (nO)4 Ω version4.47 %
8 Ω version4.43 %
16 Ω version3.89 %
Resonance Frequency (ƒS)4 Ω version102.00 Hz
8 Ω version106.20 Hz
16 Ω version107.00 Hz
Sensitivity @ 1W, 1m4 Ω version99.40 dB
8 Ω version99.00 dB
16 Ω version99.00 dB
Surround MaterialIntegrated Paper
Surround TreatmentYes
Total Q Factor (QTS)4 Ω version0.52
8 Ω version0.67
16 Ω version0.75
Voice Coil DC Resistance (Re)4 Ω version3.25 Ω
8 Ω version6.53 Ω
16 Ω version12.00 Ω
Voice Coil Diameter2 in.
Voice Coil FormerKapton
Voice Coil Inductance @ 1 kHZ (LE)4 Ω version0.61 mH
8 Ω version0.84 mH
16 Ω version1.36 mH
Voice Coil Winding Depth10.00 mm
Voice Coil Winding TypeCopper
Packaging Information
Packaging Dimensions13.3858 in. × 13.3858 in. × 7.874 in.
Weight (Packaging)10.65 lbs.

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Specifications, Files, and Documents

Sound Samples:

PDF: Specification Sheet Specification Sheet578.66 KB
PNG: Terminal Dimensions Terminal Dimensions21.21 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on January 19th, 2017.
Matt H
January 19th, 2017
This would be a nice change if you are looking for something different. These speakers will be voiced with more of an American flavor as compared to the typical British style of speakers. For more information please see the Jensen Tone Generator: https://www.jensentone.com/tone_generator

Product Reviews

5.00 out of 5 based on 3 reviews
- December 6th, 2019
5 out of 5

I bought this speaker to install in my Fender `65 Deluxe Reverb Reissue Amp. It is the same as the speaker that came in this amp but I had installed a Jensen 12" Electric Lightning 70 in it a few years ago to brighten up the sound a bit. This proved to be a little too bright so I decided to go back to what was originally in the amp (the original Jensen C12K now resides in the extension cabinet for my Fender Hot Rod Deluxe Amp). Jensen speakers are good solid performers with a reputation that goes back decades. Fender made a real good choice using them in some of their amps and I`m happy with the sound of this new C12K in this amp. What will I do with the 12" Electric Lightning 70? Well... I have a Fender Blues Jr. Amp ...

- May 16th, 2018
5 out of 5

This is my favourite speaker. It has such a sweet sound and it's never too boomy. I'd highly recommend it for all styles of music. It's the stock speaker in my deluxe reverb and I had to get another one so I could have that familiar sound in a different cab. Amplified parts shipped it out very fast!

- October 1st, 2010
5 out of 5

This speaker unbeknownst to me is what Fender now puts into their reissue Deluxe Reverbs. It replaces an aging Oxford in my own DRRI and the sonic improvement after the install was astounding. Deeper lows without flapping, tighter midrange and smoother highs, totally bringing the character of this venerable amp in line with my expectations.

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