Hertz ES 200.5

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.8dB
• Frequency response 30 - 400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 10.57
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.50

Large signal parameters

• Maximum linear excursion xmax 9mm
• Maximum excursion before damage xlim 13mm
• Air volume displaced at xmax VD 194cm³
• Power handling P 200W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.9Ω
• Inductance (1kHz) LE 1.9mH
• VC Diameter 50mm

Magnet

• Force factor Bl 10.9N/A
• Motor constant Bl/√RE 6.4N/√W

Diaphragm

• Effective diameter 165mm
• Effective area SD 215cm²
• Moving mass MMS 80g
• Moving mass (without air load) MMD 77.7g

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 10.5L
• Mechanical resistance RMS 1.9N·s/m

Dimensions

• Nominal diameter 8″
• 200mm
• Volume occupied by the driver (estimated) 0.82L