Fostex FF225WK

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.8dB
• Frequency response 44 - 17000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 44Hz
• Mechanical quality factor QMS 2.31
• Electrical quality factor QES 0.41
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 2.3mm
• Air volume displaced at xmax VD 50cm³
• Power handling P 34W
• Program power Pmax 100W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 0.068mH
• VC Diameter 50mm

Magnet

• Force factor Bl 8.49N/A
• Motor constant Bl/√RE 3.47N/√W
• Weight 1.067kg

Diaphragm

• Effective diameter 168mm
• Effective area SD 220cm²
• Moving mass MMS 18.4g
• Moving mass (without air load) MMD 16g

Suspensions

• Stiffness KMS 1.21N/mm
• Compliance CMS 826µm/N
• Equivalent volume to the compliance VAS 57.9L
• Mechanical resistance RMS 2.2N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 208mm
• Baffle cutout diameter 185mm
• Overall depth 92mm
• Volume occupied by the driver (estimated) 1.1L
• Net weight 3.52kg