Hertz Cento CX 165

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88dB
• Frequency response 55 - 22000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 65Hz
• Mechanical quality factor QMS 3.40
• Electrical quality factor QES 0.73
• Total quality factor QTS 0.60

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Maximum excursion before damage xlim 4.9mm
• Air volume displaced at xmax VD 48cm³
• Power handling P 70W
• Program power Pmax 140W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.21mH
• VC Diameter 25mm

Magnet

• Force factor Bl 4.8N/A
• Motor constant Bl/√RE 2.68N/√W
• Diameter 85mm
• Material Ferrite

Diaphragm

• Effective diameter 132mm
• Effective area SD 137cm²
• Moving mass MMS 13.3g
• Moving mass (without air load) MMD 12.1g
• Material Semi-pressed paper + Mica

Suspensions

• Stiffness KMS 2.17N/mm
• Compliance CMS 460µm/N
• Equivalent volume to the compliance VAS 12.2L
• Mechanical resistance RMS 1.6N·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) 0.34L
• Net weight 0.95kg