Hertz Mille MPS 300 S4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.3dB
• Frequency response 25 - 400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 23Hz
• Mechanical quality factor QMS 6.30
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.42

Large signal parameters

• Maximum linear excursion xmax 16.8mm
• Maximum excursion before damage xlim 20mm
• Air volume displaced at xmax VD 908cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz) LE 3.75mH
• VC Diameter 38mm

Magnet

• Force factor Bl 18.7N/A
• Motor constant Bl/√RE 10.1N/√W
• Diameter 156mm
• Height 36mm
• Material Ferrite

Diaphragm

• Effective diameter 263mm
• Effective area SD 540cm²
• Moving mass MMS 320g
• Moving mass (without air load) MMD 311g
• Material Polypropylene

Suspensions

• Stiffness KMS 6.67N/mm
• Compliance CMS 150µm/N
• Equivalent volume to the compliance VAS 62.1L
• Mechanical resistance RMS 7.34N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Overall depth 109mm
• Flange thickness 21mm
• Mounting depth 88mm
• Volume occupied by the driver (estimated) 2.4L
• Net weight 6.64kg