C12K

C12K

General Characteristics for 4Ω

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

Thiele-Small Parameters for 4Ω

Voice Coil DC Resistance
RE
3.25 Ω
Resonance Frequency
ƒS
102 Hz
Mechanical Q Factor
QMS
19.8
Electrical Q Factor
QES
0.53
Total Q Factor
QTS
0.52
Mechanical Moving Mass
MMS
34.9 g
Mechanical Compliance
CMS
70 µm/N
Force Factor
BxL
11.65 Wb/m
Equivalent Acoustic Volume
VAS
23.6 lt.
Maximum Linear Displacement
XMAX
± 1 mm
Reference Efficiency
nO
4.47 %
Diaphragm Area
SD
490.9 cm2
Losses Electrical Resistance
RES
120 Ω
Voice Coil Inductance @ 1kHz
LE
0.61 mH

Constructive Characteristics for 4Ω

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

Electrical Characteristics for 4Ω

Nominal Impedance
4 Ω
Rated Power
100 W
Musical Power
200 W
Sensitivity@1W,1m
99.4 dB

General Characteristics for 8Ω

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

Thiele-Small Parameters for 8Ω

Voice Coil DC Resistance
RE
6.75 Ω
Resonance Frequency
ƒS
115 Hz
Mechanical Q Factor
QMS
16.4
Electrical Q Factor
QES
0.86
Total Q Factor
QTS
0.82
Mechanical Moving Mass
MMS
33.4 g
Mechanical Compliance
CMS
57 µm/N
Force Factor
BxL
13.7 Wb/m
Equivalent Acoustic Volume
VAS
19.6 lt.
Maximum Linear Displacement
XMAX
± 1 mm
Reference Efficiency
nO
4.43 %
Diaphragm Area
SD
490.9 cm2
Losses Electrical Resistance
RES
210 Ω
Voice Coil Inductance @ 1kHz
LE
0.84 mH

Constructive Characteristics for 8Ω

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

Electrical Characteristics for 8Ω

Nominal Impedance
8 Ω
Rated Power
100 W
Musical Power
200 W
Sensitivity@1W,1m
99 dB

General Characteristics for 16Ω

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

Thiele-Small Parameters for 16Ω

Voice Coil DC Resistance
RE
12 Ω
Resonance Frequency
ƒS
113.3 Hz
Mechanical Q Factor
QMS
17.41
Electrical Q Factor
QES
0.90
Total Q Factor
QTS
0.86
Mechanical Moving Mass
MMS
35.6 g
Mechanical Compliance
CMS
55 µm/N
Force Factor
BxL
18.3 Wb/m
Equivalent Acoustic Volume
VAS
19 lt.
Maximum Linear Displacement
XMAX
± 1 mm
Reference Efficiency
nO
3.89 %
Diaphragm Area
SD
490.9 cm2
Losses Electrical Resistance
RES
360 Ω
Voice Coil Inductance @ 1kHz
LE
1.36 mH

Constructive Characteristics for 16Ω

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

Electrical Characteristics for 16Ω

Nominal Impedance
16 Ω
Rated Power
100 W
Musical Power
200 W
Sensitivity@1W,1m
99 dB
12",
100 watts

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.

Lows
Tight
Mids
Aggressive
Highs
Subtle
Overdrive
Edgy/Crunchy
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.
Sound Samples
Want a more in-depth demonstration of our speakers? Try our Jensen speaker demonstration.
Having trouble playing our sound samples? Access the files directly.
Specification Sheet
Product Dimensions
Note: all dimensions are in mm.
User Reviews

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!

Andres

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

RC

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.

Ed in Hobe Sound, FL