Hertz Mille ML 1800.3 LEGEND

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.9dB
• Frequency response 38 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 60Hz
• Mechanical quality factor QMS 7.22
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.50

Large signal parameters

• Maximum linear excursion xmax 4mm
• Maximum excursion before damage xlim 10mm
• Air volume displaced at xmax VD 68cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.35mH
• VC Diameter 50mm

Magnet

• Force factor Bl 7.8N/A
• Motor constant Bl/√RE 4.36N/√W
• Diameter 90mm
• Height 5mm
• Material Neodymium

Diaphragm

• Effective diameter 149mm
• Effective area SD 169cm²
• Moving mass MMS 27.5g
• Moving mass (without air load) MMD 25.9g
• Material Pressed-pulp cone with cotton fibres

Suspensions

• Stiffness KMS 3.33N/mm
• Compliance CMS 300µm/N
• Equivalent volume to the compliance VAS 12.2L
• Mechanical resistance RMS 1.44N·s/m

Dimensions

• Nominal diameter 7″
• 180mm
• Overall diameter 184mm
• Baffle cutout diameter 160mm
• Overall depth 88mm
• Flange thickness 12mm
• Mounting depth 76mm
• Volume occupied by the driver (estimated) 0.62L
• Net weight 1.71kg