Jensen Vintage AlNiCo P8R

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 129Hz
• Mechanical quality factor QMS 8.67
• Electrical quality factor QES 1.71
• Total quality factor QTS 1.43

Large signal parameters

• Maximum linear excursion xmax 1mm
• Air volume displaced at xmax VD 21cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz) LE 0.21mH
• VC Diameter 25mm
• Winding height HVC 4mm
• Winding material Copper
• Former material Epotex

Magnet

• Flux density B 0.96T
• Force factor Bl 3.72N/A
• Motor constant Bl/√RE 2.15N/√W
• Air gap height HAG 6mm
• Weight 0.2kg
• Material Alnico

Diaphragm

• Effective diameter 165mm
• Effective area SD 214cm²
• Moving mass MMS 9.3g
• Moving mass (without air load) MMD 7g
• Material Paper

Suspensions

• Stiffness KMS 6.1N/mm
• Compliance CMS 164µm/N
• Equivalent volume to the compliance VAS 10.5L
• Mechanical resistance RMS 0.87N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 8″
• 207mm
• Overall diameter 207mm
• Volume occupied by the driver (estimated) 0.48L
• Net weight 1.2kg
• Frame material Pressed Sheet