Hertz ES 300D.5

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.9dB
• Frequency response 25 - 250Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 9.28
• Electrical quality factor QES 0.82
• Total quality factor QTS 0.75

Large signal parameters

• Maximum linear excursion xmax 9mm
• Maximum excursion before damage xlim 14.7mm
• Air volume displaced at xmax VD 482cm³
• Power handling P 350W
• Program power Pmax 1050W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 8.0Ω
• Inductance (1kHz, in series) LE 4.8mH
• VC Diameter 60mm

Magnet

• Force factor (in series) Bl 18.4N/A
• Motor constant Bl/√RE 6.51N/√W

Diaphragm

• Effective diameter 260mm
• Effective area SD 535cm²
• Moving mass MMS 145g
• Moving mass (without air load) MMD 137g

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 44.7L
• Mechanical resistance RMS 3.93N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Volume occupied by the driver (estimated) 2.3L