Fountek FR88

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.2dB
• Frequency response 100 - 25000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 105Hz
• Mechanical quality factor QMS 2.57
• Electrical quality factor QES 0.78
• Total quality factor QTS 0.60

Large signal parameters

• Maximum linear excursion xmax 1mm
• Air volume displaced at xmax VD 2.7cm³
• Power handling P 15W
• Program power Pmax 30W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.3Ω
• Inductance (1kHz) LE 0.045mH
• VC Diameter 25mm
• Winding height HVC 5.2mm
• Winding material Copper Clad Aluminium
• Former material Aluminum

Magnet

• Flux density B 1.03T
• Force factor Bl 3.11N/A
• Motor constant Bl/√RE 1.24N/√W
• Air gap height HAG 3mm
• Material Ferrite

Diaphragm

• Effective diameter 59mm
• Effective area SD 27.3cm²
• Moving mass MMS 2g
• Moving mass (without air load) MMD 1.9g

Suspensions

• Stiffness KMS 0.887N/mm
• Compliance CMS 1127µm/N
• Equivalent volume to the compliance VAS 1.2L
• Mechanical resistance RMS 0.51N·s/m

Dimensions

• Nominal diameter 3.5″
• 88mm
• Overall diameter 88mm
• Overall depth 52mm
• Volume occupied by the driver (estimated) 0.14L
• Net weight 0.58kg