Hertz Cento CX 690

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.2dB
• Frequency response 40 - 23000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 70Hz
• Mechanical quality factor QMS 3.30
• Electrical quality factor QES 0.83
• Total quality factor QTS 0.67

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Maximum excursion before damage xlim 5.5mm
• Air volume displaced at xmax VD 53cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.2mH
• VC Diameter 30mm

Magnet

• Force factor Bl 4.9N/A
• Motor constant Bl/√RE 2.7N/√W
• Diameter 100mm
• Material High density flux ferrite

Diaphragm

• Effective diameter 139mm
• Effective area SD 152cm²
• Moving mass MMS 13g
• Moving mass (without air load) MMD 11.4g
• Material Semi-pressed paper + Mica

Suspensions

• Stiffness KMS 2.94N/mm
• Compliance CMS 340µm/N
• Equivalent volume to the compliance VAS 11.1L
• Mechanical resistance RMS 1.73N·s/m

Dimensions

• Nominal size 6 x 9″
• 238mm
• Overall diameter 238mm
• Baffle cutout diameter 224mm
• Overall depth 95mm
• Flange thickness 16mm
• Mounting depth 79mm
• Volume occupied by the driver (estimated) 0.72L
• Net weight 1.55kg