Jensen Smooth BS 8N/250A

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 59Hz
• Mechanical quality factor QMS 6.72
• Electrical quality factor QES 0.39
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 5mm
• Maximum excursion before damage xlim 8mm
• Air volume displaced at xmax VD 107cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.8mH
• VC Diameter 65mm
• Winding height HVC 18mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.04T
• Force factor Bl 12.9N/A
• Motor constant Bl/√RE 5.48N/√W
• Air gap height HAG 10mm
• Weight 0.22kg
• Material Neodymium

Diaphragm

• Effective diameter 165mm
• Effective area SD 214cm²
• Moving mass MMS 32g
• Moving mass (without air load) MMD 29.7g
• Material Paper

Suspensions

• Stiffness KMS 4.35N/mm
• Compliance CMS 230µm/N
• Equivalent volume to the compliance VAS 14.9L
• Mechanical resistance RMS 1.77N·s/m
• Surround material Treated Cloth

Dimensions

• Nominal diameter 8″
• 210mm
• Overall diameter 210mm
• Volume occupied by the driver (estimated) 0.74L
• Net weight 1.8kg
• Frame material Aluminium Die-Cast