Hertz CPK 165 PRO

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.7dB
• Frequency response 45 - 22500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 60Hz
• Mechanical quality factor QMS 4.30
• Electrical quality factor QES 0.66
• Total quality factor QTS 0.57

Large signal parameters

• Maximum linear excursion xmax 3.9mm
• Air volume displaced at xmax VD 53cm³
• Power handling P 105W
• Program power Pmax 315W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.3mH
• VC Diameter 25mm

Magnet

• Force factor Bl 5.45N/A
• Motor constant Bl/√RE 3N/√W
• Material High density flux ferrite

Diaphragm

• Effective diameter 132mm
• Effective area SD 136cm²
• Moving mass MMS 15.4g
• Moving mass (without air load) MMD 14.2g
• Material Pressed-paper cone

Suspensions

• Stiffness KMS 2.27N/mm
• Compliance CMS 440µm/N
• Equivalent volume to the compliance VAS 11.5L
• Mechanical resistance RMS 1.35N·s/m

Dimensions

• Nominal diameter 6.5″
• 165mm
• Volume occupied by the driver (estimated) 0.5L