Hertz SX 380D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.4dB
• Frequency response 25 - 600Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 43Hz
• Mechanical quality factor QMS 9.30
• Electrical quality factor QES 0.70
• Total quality factor QTS 0.67

Large signal parameters

• Maximum linear excursion xmax 14mm
• Maximum excursion before damage xlim 23mm
• Air volume displaced at xmax VD 1115cm³
• Power handling P 1000W
• Program power Pmax 4000W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 4.0Ω
• Inductance (1kHz, in series, estimated) LE 3.72mH
• VC Diameter 65mm

Magnet

• Force factor (in series) Bl 20.7N/A
• Motor constant Bl/√RE 10.4N/√W
• Material Double magnet, High density flux ferrite

Diaphragm

• Effective diameter 320mm
• Effective area SD 797cm²
• Moving mass MMS 274g
• Moving mass (without air load) MMD 258g
• Material Pressed paper

Suspensions

• Stiffness KMS 20N/mm
• Compliance CMS 50µm/N
• Equivalent volume to the compliance VAS 45L
• Mechanical resistance RMS 7.96N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Volume occupied by the driver (estimated) 4.3L