PUNKTKILDE FSB022540-0402

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85dB

Thiele & Small parameters

• Resonance frequency (free air) fS 78.8Hz
• Mechanical quality factor QMS 5.22
• Electrical quality factor QES 0.58
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 3.6mm
• Maximum excursion before damage xlim 9.5mm
• Air volume displaced at xmax VD 20cm³
• Power handling P 25W
• Program power Pmax 50W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 4.0Ω
• Inductance (1kHz) LE 0.29mH
• VC Diameter 25.4mm
• Winding height HVC 13.2mm
• Winding material PESVW
• Former material Aluminum

Magnet

• Force factor Bl 5.03N/A
• Motor constant Bl/√RE 2.53N/√W
• Air gap height HAG 6mm
• Material Ferrite

Diaphragm

• Effective diameter 85mm
• Effective area SD 56.8cm²
• Moving mass MMS 7.47g
• Moving mass (without air load) MMD 7.2g
• Material Paper

Suspensions

• Stiffness KMS 1.83N/mm
• Compliance CMS 546µm/N
• Equivalent volume to the compliance VAS 2.49L
• Mechanical resistance RMS 0.709N·s/m

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.36L
• Net weight 0.915kg
• Frame material Steel