Jensen Vintage Ceramic C12Q

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 86Hz
• Mechanical quality factor QMS 10.16
• Electrical quality factor QES 2.47
• Total quality factor QTS 1.99

Large signal parameters

• Maximum linear excursion xmax 1.5mm
• Air volume displaced at xmax VD 74cm³
• Power handling P 35W
• Program power Pmax 70W

Voice Coil

• Nominal impedance Z 16Ω
• DC resistance RE 12.0Ω
• Inductance (1kHz) LE 0.95mH
• VC Diameter 32mm
• Winding height HVC 9mm
• Winding material Copper
• Former material Epotex

Magnet

• Flux density B 0.92T
• Force factor Bl 8.16N/A
• Motor constant Bl/√RE 2.36N/√W
• Air gap height HAG 6mm
• Weight 0.426kg
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 24.3g
• Moving mass (without air load) MMD 16.5g
• Material Paper

Suspensions

• Stiffness KMS 7.3N/mm
• Compliance CMS 137µm/N
• Equivalent volume to the compliance VAS 46.3L
• Mechanical resistance RMS 1.29N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 12″
• 306mm
• Overall diameter 306mm
• Volume occupied by the driver (estimated) 0.74L
• Net weight 1.8kg
• Frame material Pressed Sheet