Hertz Mille MPS 250 S2

• Sensitivity (1W, 1m, infinite baffle) SPL1W 82.9dB
• Frequency response 25 - 400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 28Hz
• Mechanical quality factor QMS 5.30
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.41

Large signal parameters

• Maximum linear excursion xmax 16.8mm
• Maximum excursion before damage xlim 20mm
• Air volume displaced at xmax VD 612cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 2Ω
• DC resistance RE 2.2Ω
• Inductance (1kHz) LE 2.67mH
• VC Diameter 38mm

Magnet

• Force factor Bl 14.7N/A
• Motor constant Bl/√RE 9.91N/√W
• Diameter 134mm
• Height 36mm
• Material Ferrite

Diaphragm

• Effective diameter 217mm
• Effective area SD 365cm²
• Moving mass MMS 250g
• Moving mass (without air load) MMD 245g
• Material Polypropylene

Suspensions

• Stiffness KMS 7.69N/mm
• Compliance CMS 130µm/N
• Equivalent volume to the compliance VAS 24.5L
• Mechanical resistance RMS 8.3N·s/m

Dimensions

• Nominal diameter 10″
• 250mm
• Overall diameter 275mm
• Baffle cutout diameter 232mm
• Overall depth 103mm
• Flange thickness 20mm
• Mounting depth 83mm
• Volume occupied by the driver 1L
• Net weight 5.11kg