Fostex FE103NV2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.1dB
• Frequency response 92 - 22000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 91.8Hz
• Mechanical quality factor QMS 5.20
• Electrical quality factor QES 0.50
• Total quality factor QTS 0.46

Large signal parameters

• Power handling P 5W
• Program power Pmax 15W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.7Ω
• Inductance (1kHz) LE 0.2mH
• VC Diameter 20mm

Magnet

• Force factor Bl 4.7N/A
• Motor constant Bl/√RE 1.69N/√W

Diaphragm

• Effective diameter 80mm
• Effective area SD 50.3cm²
• Moving mass MMS 2.5g
• Moving mass (without air load) MMD 2.2g

Suspensions

• Stiffness KMS 0.833N/mm
• Compliance CMS 1200µm/N
• Equivalent volume to the compliance VAS 4.3L
• Mechanical resistance RMS 0.28N·s/m

Dimensions

• Nominal diameter 4″
• 100mm
• Overall size 107 x 107mm
• Baffle cutout diameter 93mm
• Volume occupied by the driver (estimated) 0.22L
• Net weight 0.566kg