Hertz ECX 690.5

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.4dB
• Frequency response 40 - 23000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 59Hz
• Mechanical quality factor QMS 3.70
• Electrical quality factor QES 0.91
• Total quality factor QTS 0.73

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Air volume displaced at xmax VD 81cm³
• Power handling P 100W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz, estimated) LE 0.52mH
• VC Diameter 25mm

Magnet

• Force factor Bl 5N/A
• Motor constant Bl/√RE 2.75N/√W
• Material High density flux ferrite

Diaphragm

• Effective diameter 171mm
• Effective area SD 232cm²
• Moving mass MMS 18.8g
• Moving mass (without air load) MMD 17.2g
• Material Water-repellent pressed paper

Suspensions

• Stiffness KMS 2.63N/mm
• Compliance CMS 380µm/N
• Equivalent volume to the compliance VAS 29L
• Mechanical resistance RMS 1.88N·s/m

Dimensions

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