Fostex FF165WK

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.3dB
• Frequency response 50 - 21000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 50Hz
• Mechanical quality factor QMS 4.19
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 1.9mm
• Air volume displaced at xmax VD 24cm³
• Power handling P 30W
• Program power Pmax 90W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.5Ω
• Inductance (1kHz) LE 0.056mH
• VC Diameter 35mm

Magnet

• Force factor Bl 7.23N/A
• Motor constant Bl/√RE 2.83N/√W
• Weight 0.848kg

Diaphragm

• Effective diameter 130mm
• Effective area SD 132cm²
• Moving mass MMS 9.5g
• Moving mass (without air load) MMD 8.4g

Suspensions

• Stiffness KMS 0.936N/mm
• Compliance CMS 1068µm/N
• Equivalent volume to the compliance VAS 27.8L
• Mechanical resistance RMS 0.71N·s/m

Dimensions

• Nominal diameter 6.3″
• 160mm
• Overall diameter 166mm
• Baffle cutout diameter 146mm
• Overall depth 77mm
• Volume occupied by the driver (estimated) 0.58L
• Net weight 1.95kg