Hertz CPX 690 PRO

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.3dB
• Frequency response 35 - 24000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 60Hz
• Mechanical quality factor QMS 3.50
• Electrical quality factor QES 0.74
• Total quality factor QTS 0.61

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 116cm³
• Power handling P 120W
• Program power Pmax 360W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.571mH
• VC Diameter 30mm

Magnet

• Force factor Bl 6.28N/A
• Motor constant Bl/√RE 3.57N/√W
• Material Ferrite

Diaphragm

• Effective diameter 172mm
• Effective area SD 232cm²
• Moving mass MMS 25g
• Moving mass (without air load) MMD 23.4g
• Material Water repellent pressed paper

Suspensions

• Stiffness KMS 3.57N/mm
• Compliance CMS 280µm/N
• Equivalent volume to the compliance VAS 21.4L
• Mechanical resistance RMS 2.69N·s/m

Dimensions

• Nominal size 6 x 9″
• 152 x 229mm
• Volume occupied by the driver (estimated) 0.4L