Jensen Punch BP 12/250

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 50.2Hz
• Mechanical quality factor QMS 5.14
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 3.1mm
• Maximum excursion before damage xlim 5.5mm
• Air volume displaced at xmax VD 152cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.2Ω
• Inductance (1kHz) LE 0.94mH
• VC Diameter 65mm
• Winding height HVC 12mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 1.15T
• Force factor Bl 16.4N/A
• Motor constant Bl/√RE 6.58N/√W
• Air gap height HAG 10mm
• Weight 1.45kg
• Material Ferrite

Diaphragm

• Effective diameter 250mm
• Effective area SD 491cm²
• Moving mass MMS 46.6g
• Moving mass (without air load) MMD 38.5g
• Material Paper

Suspensions

• Stiffness KMS 4.63N/mm
• Compliance CMS 216µm/N
• Equivalent volume to the compliance VAS 73.5L
• Mechanical resistance RMS 2.86N·s/m
• Surround material Treated Cloth

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 4.8kg
• Frame material Pressed Sheet