Hertz Cento CS 300 S4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 25Hz
• Mechanical quality factor QMS 7.20
• Electrical quality factor QES 0.50
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 12.5mm
• Maximum excursion before damage xlim 16.5mm
• Air volume displaced at xmax VD 700cm³
• Power handling P 350W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 3.64mH
• VC Diameter 35mm

Magnet

• Force factor Bl 14.8N/A
• Motor constant Bl/√RE 7.8N/√W
• Diameter 134mm
• Height 34mm
• Material Ferrite

Diaphragm

• Effective diameter 268mm
• Effective area SD 560cm²
• Moving mass MMS 193g
• Moving mass (without air load) MMD 184g
• Material Polypropylene

Suspensions

• Stiffness KMS 4.76N/mm
• Compliance CMS 210µm/N
• Equivalent volume to the compliance VAS 93.4L
• Mechanical resistance RMS 4.21N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 318mm
• Baffle cutout diameter 281mm
• Overall depth 147mm
• Flange thickness 17mm
• Mounting depth 130mm
• Volume occupied by the driver (estimated) 2.4L
• Net weight 4.844kg