Jensen Smooth BS 12N/250A

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94dB

Thiele & Small parameters

• Resonance frequency (free air) fS 47Hz
• Mechanical quality factor QMS 12.58
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Maximum excursion before damage xlim 8.9mm
• Air volume displaced at xmax VD 292cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

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

Magnet

• Flux density B 1.14T
• Force factor Bl 14.4N/A
• Motor constant Bl/√RE 6.13N/√W
• Air gap height HAG 10mm
• Weight 0.22kg
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 56.7g
• Moving mass (without air load) MMD 47.8g
• Material Paper

Suspensions

• Stiffness KMS 5N/mm
• Compliance CMS 200µm/N
• Equivalent volume to the compliance VAS 81.3L
• Mechanical resistance RMS 1.33N·s/m
• Surround material Treated Cloth

Dimensions

• Nominal diameter 12″
• 320mm
• Overall diameter 320mm
• Volume occupied by the driver (estimated) 1L
• Net weight 2.5kg
• Frame material Aluminium Die-Cast