Eighteen Sound 15NCX910BE

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.2dB
• Frequency response 50 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 55Hz
• Mechanical quality factor QMS 8.20
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.33

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 617cm³
• Power handling P 450W
• Program power Pmax 900W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 1.1mH
• VC Diameter 75mm
• Winding material Copper

Magnet

• Force factor Bl 21N/A
• Motor constant Bl/√RE 9.39N/√W

Diaphragm

• Effective diameter 335mm
• Effective area SD 881cm²
• Moving mass MMS 86g
• Moving mass (without air load) MMD 67.8g

Suspensions

• Stiffness KMS 10.3N/mm
• Compliance CMS 97µm/N
• Equivalent volume to the compliance VAS 107L
• Mechanical resistance RMS 3.62N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 393mm
• Baffle cutout diameter 360mm
• Overall depth 205mm
• Flange thickness 14mm
• Mounting depth 191mm
• Volume occupied by the driver (estimated) 4.1L
• Net weight 6.5kg