Fountek FR135EX

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.9dB
• Frequency response 50 - 26000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 61.5Hz
• Mechanical quality factor QMS 1.71
• Electrical quality factor QES 0.69
• Total quality factor QTS 0.49

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 35cm³
• Power handling P 40W
• Program power Pmax 80W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz, estimated) LE 0.51mH
• VC Diameter 32mm
• Winding height HVC 4mm
• Winding material Copper
• Former material Black Aluminum

Magnet

• Flux density B 0.88T
• Force factor Bl 5.03N/A
• Motor constant Bl/√RE 2.05N/√W
• Air gap height HAG 14mm
• Material Neodymium

Diaphragm

• Effective diameter 95mm
• Effective area SD 70.5cm²
• Moving mass MMS 7.55g
• Moving mass (without air load) MMD 7.1g

Suspensions

• Stiffness KMS 1.13N/mm
• Compliance CMS 887µm/N
• Equivalent volume to the compliance VAS 2.26L
• Mechanical resistance RMS 1.71N·s/m

Dimensions

• Nominal diameter 5.5″
• 135mm
• Overall diameter 146mm
• Overall depth 73mm
• Volume occupied by the driver (estimated) 0.32L
• Net weight 0.95kg