Hertz Cento CS 250 S4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 9.40
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 12.5mm
• Maximum excursion before damage xlim 16.5mm
• Air volume displaced at xmax VD 460cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 3.33mH
• VC Diameter 35mm

Magnet

• Force factor Bl 13.7N/A
• Motor constant Bl/√RE 7.22N/√W
• Diameter 120mm
• Height 34mm
• Material Ferrite

Diaphragm

• Effective diameter 216mm
• Effective area SD 368cm²
• Moving mass MMS 154g
• Moving mass (without air load) MMD 149g
• Material Polyproyilene

Suspensions

• Stiffness KMS 5.56N/mm
• Compliance CMS 180µm/N
• Equivalent volume to the compliance VAS 34.5L
• Mechanical resistance RMS 3.09N·s/m

Dimensions

• Nominal diameter 10″
• 250mm
• Overall diameter 270mm
• Baffle cutout diameter 231mm
• Overall depth 132mm
• Flange thickness 17mm
• Mounting depth 115mm
• Volume occupied by the driver (estimated) 1.7L
• Net weight 3.795kg