Jensen Vintage Ceramic C12R

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

Thiele & Small parameters

• Resonance frequency (free air) fS 88.3Hz
• Mechanical quality factor QMS 18.52
• Electrical quality factor QES 2.85
• Total quality factor QTS 2.47

Large signal parameters

• Maximum linear excursion xmax 0.8mm
• Air volume displaced at xmax VD 39cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.7Ω
• Inductance (1kHz) LE 0.49mH
• VC Diameter 25mm
• Winding height HVC 8mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 1T
• Force factor Bl 6.24N/A
• Motor constant Bl/√RE 2.41N/√W
• Air gap height HAG 6mm
• Weight 0.27kg
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 29.5g
• Moving mass (without air load) MMD 21.7g
• Material Paper

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 37.5L
• Mechanical resistance RMS 0.88N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 12″
• 306mm
• Overall diameter 306mm
• Volume occupied by the driver (estimated) 0.56L
• Net weight 1.4kg
• Frame material Pressed Sheet