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
6.53 Ω
Resonance Frequency
ƒS
106.2 Hz
Mechanical Q Factor
QMS
12.57
Electrical Q Factor
QES
0.71
Total Q Factor
QTS
0.67
Mechanical Moving Mass
MMS
31.9 g
Mechanical Compliance
CMS
71 µm/N
Force Factor
BxL
14 Wb/m
Equivalent Acoustic Volume
VAS
24.1 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
107 Hz
Mechanical Q Factor
QMS
22.37
Electrical Q Factor
QES
0.78
Total Q Factor
QTS
0.75
Mechanical Moving Mass
MMS
29.3 g
Mechanical Compliance
CMS
77 µm/N
Force Factor
BxL
17.7 Wb/m
Equivalent Acoustic Volume
VAS
26 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
C12K
C12K
12",
100 watts
Ohms:
A real workhorse, heavy on the mids with a solid, straightforward tone. When presented with overdrive distortion it powers through with lows that are bold and heavy.
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.
Bassist Description
Boomy and round
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 measurements in mm.
Frequency Response Charts
Hover over the graph to see values. View full size graph
Hover over the graph to see values. View full size graph
Hover over the graph to see values. View full size graph
User Reviews
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
