Jensen Nighthawk C 12/75 NH

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 83Hz
• Mechanical quality factor QMS 13.20
• Electrical quality factor QES 0.67
• Total quality factor QTS 0.64

Large signal parameters

• Maximum linear excursion xmax 1mm
• Air volume displaced at xmax VD 49cm³
• Power handling P 75W
• Program power Pmax 150W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 0.62mH
• VC Diameter 44mm
• Winding height HVC 10mm
• Winding material Aluminum
• Former material Glass Fiber

Magnet

• Flux density B 1.29T
• Force factor Bl 11.8N/A
• Motor constant Bl/√RE 4.79N/√W
• Air gap height HAG 8mm
• Weight 1.45kg
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 29.7g
• Moving mass (without air load) MMD 21.8g
• Material Paper

Suspensions

• Stiffness KMS 8.07N/mm
• Compliance CMS 124µm/N
• Equivalent volume to the compliance VAS 42.4L
• Mechanical resistance RMS 1.17N·s/m
• Surround material Integrated Paper

Dimensions

• Nominal diameter 12″
• 307mm
• Overall diameter 307mm
• Volume occupied by the driver (estimated) 1.8L
• Net weight 4.3kg
• Frame material Pressed Sheet