Fostex FF105WK

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.9dB
• Frequency response 75 - 25000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 75Hz
• Mechanical quality factor QMS 4.20
• Electrical quality factor QES 0.46
• Total quality factor QTS 0.41

Large signal parameters

• Maximum linear excursion xmax 1.7mm
• Air volume displaced at xmax VD 8.5cm³
• Power handling P 10W
• Program power Pmax 30W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.7Ω
• Inductance (1kHz) LE 0.041mH
• VC Diameter 20mm

Magnet

• Force factor Bl 4.82N/A
• Motor constant Bl/√RE 1.86N/√W
• Weight 0.34kg

Diaphragm

• Effective diameter 80mm
• Effective area SD 50cm²
• Moving mass MMS 3.4g
• Moving mass (without air load) MMD 3.1g

Suspensions

• Stiffness KMS 0.743N/mm
• Compliance CMS 1346µm/N
• Equivalent volume to the compliance VAS 4.85L
• Mechanical resistance RMS 0.38N·s/m

Dimensions

• Nominal diameter 4″
• 100mm
• Overall diameter 107mm
• Baffle cutout diameter 93mm
• Overall depth 53mm
• Volume occupied by the driver (estimated) 0.19L
• Net weight 0.8kg