Jensen Vintage Ceramic C12K

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 102Hz
• Mechanical quality factor QMS 19.80
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 1mm
• Air volume displaced at xmax VD 49cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.61mH
• VC Diameter 50mm
• Winding height HVC 10mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 1.1T
• Force factor Bl 11.7N/A
• Motor constant Bl/√RE 6.46N/√W
• Air gap height HAG 8mm
• Weight 1.45kg
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 34.9g
• Moving mass (without air load) MMD 27g
• Material Paper

Suspensions

• Stiffness KMS 14.3N/mm
• Compliance CMS 70µm/N
• Equivalent volume to the compliance VAS 23.6L
• Mechanical resistance RMS 1.13N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 12″
• 307mm
• Overall diameter 307mm
• Volume occupied by the driver (estimated) 1.8L
• Net weight 4.3kg
• Frame material Pressed Sheet