C12K

General Characteristics for 4Ω
Nominal Overall Diameter307 mm12 in
Nominal Voice Coil Diameter50 mm2 in
Magnet Weight1450 g50 oz
Overall Weight9.65 lbs
Flux Density1.10 T
Thiele-Small Parameters for 4Ω
Voice Coil DC ResistanceRE3.25 Ω
Resonance FrequencyƒS102.0 Hz
Mechanical Q FactorQMS19.80
Electrical Q FactorQES0.54
Total Q FactorQTS0.52
Mechanical Moving MassMMS34.9 g
Mechanical ComplianceCMS70 µm/N
Force FactorBxL11.65 Wb/m
Equivalent Acoustic VolumeVAS23.6 lt.
Maximum Linear DisplacementXMAX1.0 mm
Reference EfficiencynO4.47 %
Diaphragm AreaSD490.9 cm2
Losses Electrical ResistanceRES120 Ω
Voice Coil Inductance @ 1kHzLE0.61 mH
Constructive Characteristics for 4Ω
MagnetFerrite
Voice Coil WindingCopper
Voice Coil FormerKapton
ConePaper
SurroundIntegrated Paper
Dust DomeNon Treated Cloth
BasketPressed Sheet Steel
Electrical Characteristics for 4Ω
Nominal Impedance4 Ω
Rated Power100 W
Musical Power200 W
Sensitivity@1W,1m99.4 db
General Characteristics for 8Ω
Nominal Overall Diameter307 mm12 in
Nominal Voice Coil Diameter50 mm2 in
Magnet Weight1450 g50 oz
Overall Weight9.65 lbs
Flux Density1.10 T
Thiele-Small Parameters for 8Ω
Voice Coil DC ResistanceRE7.0 Ω
Resonance FrequencyƒS104.0 Hz
Mechanical Q FactorQMS20.41
Electrical Q FactorQES0.67
Total Q FactorQTS0.65
Mechanical Moving MassMMS28.8 g
Mechanical ComplianceCMS82 µm/N
Force FactorBxL13.95 Wb/m
Equivalent Acoustic VolumeVAS27.6 lt.
Maximum Linear DisplacementXMAX1.0 mm
Reference EfficiencynO4.43 %
Diaphragm AreaSD490.9 cm2
Losses Electrical ResistanceRES210 Ω
Voice Coil Inductance @ 1kHzLE0.84 mH
Constructive Characteristics for 8Ω
MagnetFerrite
Voice Coil WindingCopper
Voice Coil FormerKapton
ConePaper
SurroundIntegrated Paper
Dust DomeNon Treated Cloth
BasketPressed Sheet Steel
Electrical Characteristics for 8Ω
Nominal Impedance8 Ω
Rated Power100 W
Musical Power200 W
Sensitivity@1W,1m99.1 db
General Characteristics for 16Ω
Nominal Overall Diameter307 mm12 in
Nominal Voice Coil Diameter50 mm2 in
Magnet Weight1450 g50 oz
Overall Weight9.65 lbs
Flux Density1.10 T
Thiele-Small Parameters for 16Ω
Voice Coil DC ResistanceRE12.00 Ω
Resonance FrequencyƒS107.0 Hz
Mechanical Q FactorQMS22.37
Electrical Q FactorQES0.78
Total Q FactorQTS0.75
Mechanical Moving MassMMS29.3 g
Mechanical ComplianceCMS77 µm/N
Force FactorBxL17.70 Wb/m
Equivalent Acoustic VolumeVAS26.0 lt.
Maximum Linear DisplacementXMAX1.0 mm
Reference EfficiencynO3.89 %
Diaphragm AreaSD490.9 cm2
Losses Electrical ResistanceRES360 Ω
Voice Coil Inductance @ 1kHzLE1.36 mH
Constructive Characteristics for 16Ω
MagnetFerrite
Voice Coil WindingCopper
Voice Coil FormerKapton
ConePaper
SurroundIntegrated Paper
Dust DomeNon Treated Cloth
BasketPressed Sheet Steel
Electrical Characteristics for 16Ω
Nominal Impedance16 Ω
Rated Power100 W
Musical Power200 W
Sensitivity@1W,1m99.0 db
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.

Specification Sheets:
Product Dimensions: 
Frequency Response Charts:

User Reviews

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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

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