Eighteen Sound 12NCX910BE

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.8dB
• Frequency response 60 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 57Hz
• Mechanical quality factor QMS 10.00
• Electrical quality factor QES 0.31
• Total quality factor QTS 0.30

Large signal parameters

• Maximum linear excursion xmax 6.9mm
• Air volume displaced at xmax VD 366cm³
• Power handling P 450W
• Program power Pmax 900W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 0.78mH
• VC Diameter 75mm

Magnet

• Force factor Bl 18.1N/A
• Motor constant Bl/√RE 7.86N/√W
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 53g
• Moving mass (without air load) MMD 44.4g

Suspensions

• Stiffness KMS 6.8N/mm
• Compliance CMS 147µm/N
• Equivalent volume to the compliance VAS 58L
• Mechanical resistance RMS 1.9N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 310mm
• Baffle cutout diameter 283mm
• Overall depth 210mm
• Flange thickness 13mm
• Mounting depth 197mm
• Volume occupied by the driver (estimated) 3.4L
• Net weight 6.0kg