Focal UTOPIA M Sub 10 WM

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.2dB
• Frequency response 25 - 800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 6.70
• Electrical quality factor QES 0.76
• Total quality factor QTS 0.65

Large signal parameters

• Maximum linear excursion xmax 17mm
• Air volume displaced at xmax VD 556cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.2Ω
• Inductance (1kHz, in series, estimated) LE 3.65mH
• VC Diameter 120mm
• Winding material Copper Clad Aluminium
• Former material Glass Fiber

Magnet

• Force factor (in series) Bl 16N/A
• Motor constant Bl/√RE 6.43N/√W

Diaphragm

• Effective diameter 204mm
• Effective area SD 327cm²
• Moving mass MMS 138g
• Moving mass (without air load) MMD 134g
• Material M-shape W

Suspensions

• Stiffness KMS 5.56N/mm
• Compliance CMS 180µm/N
• Equivalent volume to the compliance VAS 28L
• Mechanical resistance RMS 4.01N·s/m
• Surround material Butyl

Dimensions

• Nominal diameter 10″
• 254mm
• Baffle cutout diameter 235mm
• Mounting depth 108mm
• Volume occupied by the driver (estimated) 3.6L
• Net weight 8.1kg