Eighteen Sound 15ND930

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.5dB
• Frequency response 40 - 4100Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 7.10
• Electrical quality factor QES 0.24
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 7.5mm
• Air volume displaced at xmax VD 638cm³
• Power handling P 500W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.8Ω
• Inductance (1kHz) LE 0.52mH
• VC Diameter 75mm
• Winding material Aluminum

Magnet

• Force factor Bl 17N/A
• Motor constant Bl/√RE 10.2N/√W
• Material Neodymium

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 113g
• Moving mass (without air load) MMD 95.7g
• Material Weather protected

Suspensions

• Stiffness KMS 5.46N/mm
• Compliance CMS 183µm/N
• Equivalent volume to the compliance VAS 182L
• Mechanical resistance RMS 3.5N·s/m

Dimensions

• Nominal diameter 15″
• 380mm
• Overall diameter 387mm
• Baffle cutout diameter 353mm
• Overall depth 177mm
• Flange thickness 11mm
• Mounting depth 166mm
• Volume occupied by the driver (estimated) 3L
• Net weight 4.7kg