Jensen Punch BP 15/250

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 47Hz
• Mechanical quality factor QMS 4.26
• Electrical quality factor QES 0.58
• Total quality factor QTS 0.51

Large signal parameters

• Maximum linear excursion xmax 3.4mm
• Maximum excursion before damage xlim 7mm
• Air volume displaced at xmax VD 257cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.6Ω
• Inductance (1kHz) LE 1.07mH
• VC Diameter 65mm
• Winding height HVC 13mm
• Winding material Copper
• Former material Aluminum

Magnet

• Flux density B 1.15T
• Force factor Bl 15.3N/A
• Motor constant Bl/√RE 5.96N/√W
• Air gap height HAG 8mm
• Weight 1.45kg
• Material Ferrite

Diaphragm

• Effective diameter 310mm
• Effective area SD 755cm²
• Moving mass MMS 69.7g
• Moving mass (without air load) MMD 54.6g
• Material Paper

Suspensions

• Stiffness KMS 6.1N/mm
• Compliance CMS 164µm/N
• Equivalent volume to the compliance VAS 133L
• Mechanical resistance RMS 4.83N·s/m
• Surround material Treated Cloth

Dimensions

• Nominal diameter 15″
• 385mm
• Overall diameter 385mm
• Volume occupied by the driver (estimated) 2.4L
• Net weight 5.4kg
• Frame material Pressed Sheet