Fostex FW305

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.4dB
• Frequency response 25 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 25Hz
• Mechanical quality factor QMS 2.73
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.31

Large signal parameters

• Maximum linear excursion xmax 4.8mm
• Air volume displaced at xmax VD 253cm³
• Power handling P 40W
• Program power Pmax 125W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.6Ω
• Inductance (1kHz, estimated) LE 1.05mH

Magnet

• Force factor Bl 14.3N/A
• Motor constant Bl/√RE 5.57N/√W
• Weight 1.41kg

Diaphragm

• Effective diameter 259mm
• Effective area SD 527cm²
• Moving mass MMS 55g
• Moving mass (without air load) MMD 46.4g

Suspensions

• Stiffness KMS 1.55N/mm
• Compliance CMS 645µm/N
• Equivalent volume to the compliance VAS 254L
• Mechanical resistance RMS 3.16N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 312mm
• Baffle cutout diameter 280mm
• Overall depth 121mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 5.0kg