Fountek FW100B

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.2dB
• Frequency response 77 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 77Hz
• Mechanical quality factor QMS 3.09
• Electrical quality factor QES 0.79
• Total quality factor QTS 0.63

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 22cm³
• Power handling P 35W
• Program power Pmax 70W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.2Ω
• Inductance (1kHz, estimated) LE 0.55mH
• VC Diameter 26mm
• Winding height HVC 14mm
• Winding material Copper
• Former material Aluminum

Magnet

• Flux density B 1T
• Force factor Bl 5.59N/A
• Motor constant Bl/√RE 2.24N/√W
• Air gap height HAG 14mm
• Material Ferrite

Diaphragm

• Effective diameter 84mm
• Effective area SD 55.4cm²
• Moving mass MMS 8.04g
• Moving mass (without air load) MMD 7.7g

Suspensions

• Stiffness KMS 2.05N/mm
• Compliance CMS 487µm/N
• Equivalent volume to the compliance VAS 2.12L
• Mechanical resistance RMS 1.26N·s/m

Dimensions

• Nominal diameter 4″
• 100mm
• Overall diameter 105mm
• Overall depth 60mm
• Volume occupied by the driver (estimated) 0.22L
• Net weight 0.9kg