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
6.53 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

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
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Specification Sheet
Product Dimensions
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