Hertz ES 300.5

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.1dB
• Frequency response 25 - 250Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 11.40
• Electrical quality factor QES 0.70
• Total quality factor QTS 0.66

Large signal parameters

• Maximum linear excursion xmax 9mm
• Maximum excursion before damage xlim 13.5mm
• Air volume displaced at xmax VD 480cm³
• Power handling P 350W
• Program power Pmax 1050W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 2.75mH
• VC Diameter 60mm

Magnet

• Force factor Bl 12.6N/A
• Motor constant Bl/√RE 7.16N/√W

Diaphragm

• Effective diameter 260mm
• Effective area SD 534cm²
• Moving mass MMS 155g
• Moving mass (without air load) MMD 147g

Suspensions

• Stiffness KMS 8.33N/mm
• Compliance CMS 120µm/N
• Equivalent volume to the compliance VAS 48.5L
• Mechanical resistance RMS 2.99N·s/m

Dimensions

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