Eighteen Sound 12MB600

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.5dB
• Frequency response 58 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 4.89
• Electrical quality factor QES 0.19
• Total quality factor QTS 0.19

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 239cm³
• Power handling P 450W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.7Ω
• Inductance (1kHz) LE 0.45mH
• VC Diameter 75mm

Magnet

• Force factor Bl 14.9N/A
• Motor constant Bl/√RE 9.07N/√W

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 56g
• Moving mass (without air load) MMD 47.2g

Suspensions

• Stiffness KMS 4.67N/mm
• Compliance CMS 214µm/N
• Equivalent volume to the compliance VAS 86L
• Mechanical resistance RMS 3.31N·s/m

Dimensions

• Nominal diameter 12″
• 315mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Overall depth 147mm
• Flange thickness 16mm
• Mounting depth 131mm
• Volume occupied by the driver (estimated) 3.4L
• Net weight 8.3kg