Hertz Cento C 165 L

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.6dB
• Frequency response 50 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 60Hz
• Mechanical quality factor QMS 3.80
• Electrical quality factor QES 0.70
• Total quality factor QTS 0.60

Large signal parameters

• Maximum linear excursion xmax 5.1mm
• Maximum excursion before damage xlim 6.1mm
• Air volume displaced at xmax VD 69cm³
• Power handling P 80W
• Program power Pmax 240W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.23mH
• VC Diameter 25mm

Magnet

• Force factor Bl 4.9N/A
• Motor constant Bl/√RE 2.74N/√W
• Diameter 85mm
• Height 17mm
• Material Ferrite

Diaphragm

• Effective diameter 132mm
• Effective area SD 136cm²
• Moving mass MMS 14.2g
• Moving mass (without air load) MMD 13g
• Material Water repellent non pressed paper

Suspensions

• Stiffness KMS 1.92N/mm
• Compliance CMS 520µm/N
• Equivalent volume to the compliance VAS 13.7L
• Mechanical resistance RMS 1.41N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Overall diameter 165mm
• Baffle cutout diameter 142mm
• Overall depth 71mm
• Flange thickness 8mm
• Mounting depth 63mm
• Volume occupied by the driver (estimated) 0.35L
• Net weight 0.973kg