Jensen Mod 12-70

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 74Hz
• Mechanical quality factor QMS 14.63
• Electrical quality factor QES 0.96
• Total quality factor QTS 0.90

Large signal parameters

• Maximum linear excursion xmax 1.5mm
• Air volume displaced at xmax VD 74cm³
• Power handling P 70W
• Program power Pmax 140W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.5Ω
• Inductance (1kHz) LE 0.43mH
• VC Diameter 38mm
• Winding material Copper
• Former material Epotex

Magnet

• Flux density B 1.16T
• Force factor Bl 7.23N/A
• Motor constant Bl/√RE 3.85N/√W
• Weight 0.64kg
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 30.6g
• Moving mass (without air load) MMD 22.8g
• Material Paper

Suspensions

• Stiffness KMS 6.62N/mm
• Compliance CMS 151µm/N
• Equivalent volume to the compliance VAS 51.7L
• Mechanical resistance RMS 0.97N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 12″
• 306mm
• Overall diameter 306mm
• Volume occupied by the driver (estimated) 1L
• Net weight 2.4kg
• Frame material Pressed Sheet