Hertz Cento C 165 F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.4dB
• Frequency response 65 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 80Hz
• Mechanical quality factor QMS 3.40
• Electrical quality factor QES 1.00
• Total quality factor QTS 0.80

Large signal parameters

• Maximum linear excursion xmax 3.2mm
• Maximum excursion before damage xlim 3.5mm
• Air volume displaced at xmax VD 45cm³
• Power handling P 70W
• Program power Pmax 180W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.7Ω
• Inductance (1kHz) LE 0.154mH
• VC Diameter 25mm

Magnet

• Force factor Bl 3.9N/A
• Motor constant Bl/√RE 2.37N/√W
• Diameter 90mm
• Height 10mm
• Material Ferrite

Diaphragm

• Effective diameter 134mm
• Effective area SD 142cm²
• Moving mass MMS 12g
• Moving mass (without air load) MMD 10.8g
• Material Semi-Pressed paper with Mica

Suspensions

• Stiffness KMS 3.03N/mm
• Compliance CMS 330µm/N
• Equivalent volume to the compliance VAS 9.4L
• Mechanical resistance RMS 1.77N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Overall diameter 165mm
• Baffle cutout diameter 141mm
• Overall depth 51mm
• Flange thickness 7mm
• Mounting depth 44mm
• Volume occupied by the driver (estimated) 0.23L
• Net weight 0.72kg