Eighteen Sound 12MB600 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.1dB
• Frequency response 58 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 44Hz
• Mechanical quality factor QMS 3.90
• Electrical quality factor QES 0.19
• Total quality factor QTS 0.18

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 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 1.32mH
• VC Diameter 75mm

Magnet

• Force factor Bl 18N/A
• Motor constant Bl/√RE 8.05N/√W

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 43g
• Moving mass (without air load) MMD 34.2g

Suspensions

• Stiffness KMS 3.29N/mm
• Compliance CMS 304µm/N
• Equivalent volume to the compliance VAS 115L
• Mechanical resistance RMS 3.05N·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