Eighteen Sound 12NMB1000

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.3dB
• Frequency response 60 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 54Hz
• Mechanical quality factor QMS 8.40
• Electrical quality factor QES 0.19
• Total quality factor QTS 0.19

Large signal parameters

• Maximum linear excursion xmax 3.5mm
• Air volume displaced at xmax VD 186cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz) LE 0.69mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 24.4N/A
• Motor constant Bl/√RE 10.4N/√W
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 61g
• Moving mass (without air load) MMD 52.2g
• Material Weather protected

Suspensions

• Stiffness KMS 7.04N/mm
• Compliance CMS 142µm/N
• Equivalent volume to the compliance VAS 58L
• Mechanical resistance RMS 2.46N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Overall depth 116mm
• Flange thickness 18mm
• Mounting depth 98mm
• Volume occupied by the driver (estimated) 2.2L
• Net weight 5.6kg