Fostex FW405N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.3dB
• Frequency response 27 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 27Hz
• Mechanical quality factor QMS 6.76
• Electrical quality factor QES 0.48
• Total quality factor QTS 0.45

Large signal parameters

• Maximum linear excursion xmax 7.9mm
• Air volume displaced at xmax VD 703cm³
• Power handling P 50W
• Program power Pmax 150W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.9Ω
• Inductance (1kHz) LE 0.64mH
• VC Diameter 80mm

Magnet

• Force factor Bl 15.7N/A
• Motor constant Bl/√RE 5.98N/√W
• Weight 2.29kg
• Material Ferrite

Diaphragm

• Effective diameter 337mm
• Effective area SD 890cm²
• Moving mass MMS 101g
• Moving mass (without air load) MMD 82.3g

Suspensions

• Stiffness KMS 2.91N/mm
• Compliance CMS 344µm/N
• Equivalent volume to the compliance VAS 393L
• Mechanical resistance RMS 2.53N·s/m

Dimensions

• Nominal diameter 15″
• 400mm
• Overall diameter 395mm
• Baffle cutout diameter 350mm
• Overall depth 180mm
• Volume occupied by the driver (estimated) 5L
• Net weight 10.0kg