Fostex FE126En

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.4dB
• Frequency response 83 - 25000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 83Hz
• Mechanical quality factor QMS 4.80
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.30

Large signal parameters

• Maximum linear excursion xmax 0.4mm
• Air volume displaced at xmax VD 2.3cm³
• Power handling P 15W
• Program power Pmax 45W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.2Ω
• Inductance (1kHz) LE 0.035mH
• VC Diameter 20mm

Magnet

• Force factor Bl 5.63N/A
• Motor constant Bl/√RE 2.1N/√W
• Weight 0.44kg
• Material Ferrite

Diaphragm

• Effective diameter 92mm
• Effective area SD 65cm²
• Moving mass MMS 2.8g
• Moving mass (without air load) MMD 2.4g

Suspensions

• Stiffness KMS 0.741N/mm
• Compliance CMS 1350µm/N
• Equivalent volume to the compliance VAS 8.5L
• Mechanical resistance RMS 0.3N·s/m

Dimensions

• Nominal diameter 4.7″
• 120mm
• Overall diameter 115mm
• Baffle cutout diameter 104mm
• Overall depth 61mm
• Volume occupied by the driver (estimated) 0.25L
• Net weight 0.99kg