Fountek FR88EX

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.7dB
• Frequency response 95 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 95Hz
• Mechanical quality factor QMS 1.96
• Electrical quality factor QES 0.62
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 3mm
• Air volume displaced at xmax VD 8.2cm³
• Power handling P 15W
• Program power Pmax 30W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 0.045mH
• VC Diameter 25mm
• Winding height HVC 4mm
• Winding material Copper
• Former material Aluminum

Magnet

• Flux density B 0.88T
• Force factor Bl 3.31N/A
• Motor constant Bl/√RE 1.35N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 59mm
• Effective area SD 27.3cm²
• Moving mass MMS 2.36g
• Moving mass (without air load) MMD 2.2g

Suspensions

• Stiffness KMS 0.836N/mm
• Compliance CMS 1196µm/N
• Equivalent volume to the compliance VAS 1.27L
• Mechanical resistance RMS 0.72N·s/m

Dimensions

• Nominal diameter 3.5″
• 88mm
• Overall diameter 88mm
• Overall depth 52mm
• Volume occupied by the driver (estimated) 0.11L
• Net weight 0.35kg