Jensen Vintage AlNiCo P12R

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98dB

Thiele & Small parameters

• Resonance frequency (free air) fS 77Hz
• Mechanical quality factor QMS 12.53
• Electrical quality factor QES 2.67
• Total quality factor QTS 2.20

Large signal parameters

• Maximum linear excursion xmax 0.8mm
• Air volume displaced at xmax VD 37cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 16Ω
• DC resistance RE 12.0Ω
• Inductance (1kHz) LE 0.84mH
• VC Diameter 25mm
• Winding height HVC 8mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 0.96T
• Force factor Bl 6.68N/A
• Motor constant Bl/√RE 1.93N/√W
• Air gap height HAG 6mm
• Weight 0.2kg
• Material Alnico

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 19.9g
• Moving mass (without air load) MMD 12g
• Material Paper

Suspensions

• Stiffness KMS 4.67N/mm
• Compliance CMS 214µm/N
• Equivalent volume to the compliance VAS 72.6L
• Mechanical resistance RMS 0.77N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 12″
• 307mm
• Overall diameter 307mm
• Volume occupied by the driver (estimated) 0.61L
• Net weight 1.5kg
• Frame material Pressed Sheet