Hertz SX 300D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.9dB
• Frequency response 28 - 700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 8.20
• Electrical quality factor QES 0.51
• Total quality factor QTS 0.48

Large signal parameters

• Maximum linear excursion xmax 14mm
• Maximum excursion before damage xlim 23mm
• Air volume displaced at xmax VD 679cm³
• Power handling P 800W
• Program power Pmax 3200W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 4.0Ω
• Inductance (1kHz, in series, estimated) LE 3.04mH
• VC Diameter 65mm

Magnet

• Force factor (in series) Bl 21.6N/A
• Motor constant Bl/√RE 10.8N/√W
• Material Double magnet, High density flux ferrite

Diaphragm

• Effective diameter 253mm
• Effective area SD 485cm²
• Moving mass MMS 202g
• Moving mass (without air load) MMD 194g
• Material Pressed paper

Suspensions

• Stiffness KMS 16.7N/mm
• Compliance CMS 60µm/N
• Equivalent volume to the compliance VAS 20L
• Mechanical resistance RMS 7.12N·s/m

Dimensions

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