Jensen Silverbird C 12/70 SB

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96dB

Thiele & Small parameters

• Resonance frequency (free air) fS 87Hz
• Mechanical quality factor QMS 11.79
• Electrical quality factor QES 1.13
• Total quality factor QTS 1.03

Large signal parameters

• Power handling P 70W
• Program power Pmax 140W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 0.57mH
• VC Diameter 38mm
• Winding height HVC 10mm
• Winding material Aluminum
• Former material Kapton

Magnet

• Flux density B 1.3T
• Force factor Bl 9.09N/A
• Motor constant Bl/√RE 3.71N/√W
• Air gap height HAG 6mm
• Weight 0.81kg
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 28.4g
• Moving mass (without air load) MMD 20.5g
• Material Paper

Suspensions

• Stiffness KMS 8.48N/mm
• Compliance CMS 118µm/N
• Equivalent volume to the compliance VAS 40.3L
• Mechanical resistance RMS 1.32N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 12″
• 307mm
• Overall diameter 307mm
• Volume occupied by the driver (estimated) 1.4L
• Net weight 3.3kg
• Frame material Pressed Sheet