Fountek FR59EXE

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.5dB
• Frequency response 139 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 139Hz
• Mechanical quality factor QMS 1.47
• Electrical quality factor QES 0.48
• Total quality factor QTS 0.36

Large signal parameters

• Maximum linear excursion xmax 1.4mm
• Air volume displaced at xmax VD 2.4cm³
• Power handling P 10W
• Program power Pmax 20W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.9Ω
• Inductance (1kHz, estimated) LE 0.1mH
• VC Diameter 20.4mm
• Winding height HVC 5.8mm
• Winding material Copper Clad Aluminium
• Former material Aluminum

Magnet

• Flux density B 1.08T
• Force factor Bl 2.99N/A
• Motor constant Bl/√RE 1.51N/√W
• Air gap height HAG 3mm
• Material Neodymium

Diaphragm

• Effective diameter 47mm
• Effective area SD 17cm²
• Moving mass MMS 1.27g
• Moving mass (without air load) MMD 1.2g

Suspensions

• Stiffness KMS 0.975N/mm
• Compliance CMS 1026µm/N
• Equivalent volume to the compliance VAS 0.42L
• Mechanical resistance RMS 0.76N·s/m

Dimensions

• Nominal diameter 2.5″
• 59mm
• Overall diameter 74mm
• Overall depth 32mm
• Net weight 0.221kg