Focal UTOPIA M 3.5 WM

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.7dB
• Frequency response 200 - 10000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 105Hz
• Mechanical quality factor QMS 2.00
• Electrical quality factor QES 1.00
• Total quality factor QTS 0.58

Large signal parameters

• Maximum linear excursion xmax 2.5mm
• Air volume displaced at xmax VD 9.6cm³
• Power handling P 50W
• Program power Pmax 100W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz, estimated) LE 0.17mH
• VC Diameter 45mm
• Winding material Copper Clad Aluminium
• Former material Glass Fiber

Magnet

• Force factor Bl 3N/A
• Motor constant Bl/√RE 1.7N/√W
• Diameter 42mm
• Height 4mm

Diaphragm

• Effective diameter 70mm
• Effective area SD 38.5cm²
• Moving mass MMS 4g
• Moving mass (without air load) MMD 3.8g
• Material M-shape W

Suspensions

• Stiffness KMS 2N/mm
• Compliance CMS 500µm/N
• Equivalent volume to the compliance VAS 1L
• Mechanical resistance RMS 1.32N·s/m
• Surround material Butyl

Dimensions

• Nominal diameter 3.5″
• 89mm
• Baffle cutout diameter 79mm
• Mounting depth 31mm
• Volume occupied by the driver (estimated) 0.1L
• Net weight 0.25kg