Fountek FW135H

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.5dB
• Frequency response 70 - 5500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 59.1Hz
• Mechanical quality factor QMS 1.94
• Electrical quality factor QES 0.61
• Total quality factor QTS 0.46

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 43cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz, estimated) LE 0.75mH
• VC Diameter 36mm
• Winding height HVC 14.4mm
• Winding material Copper
• Former material Black Aluminum

Magnet

• Flux density B 1T
• Force factor Bl 6.98N/A
• Motor constant Bl/√RE 2.68N/√W
• Air gap height HAG 4mm
• Material Ferrite

Diaphragm

• Effective diameter 105mm
• Effective area SD 86.6cm²
• Moving mass MMS 11.2g
• Moving mass (without air load) MMD 10.6g

Suspensions

• Stiffness KMS 1.54N/mm
• Compliance CMS 649µm/N
• Equivalent volume to the compliance VAS 6.91L
• Mechanical resistance RMS 2.13N·s/m

Dimensions

• Nominal diameter 5.25″
• 135mm
• Overall diameter 136mm
• Overall depth 78mm
• Volume occupied by the driver (estimated) 0.35L
• Net weight 1.1kg