Eighteen Sound 15ND830

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.7dB
• Frequency response 42 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 42Hz
• Mechanical quality factor QMS 7.20
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Air volume displaced at xmax VD 553cm³
• Power handling P 450W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz) LE 0.62mH
• VC Diameter 75mm
• Winding material Aluminum

Magnet

• Force factor Bl 14N/A
• Motor constant Bl/√RE 8.08N/√W
• Material Neodymium

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 85g
• Moving mass (without air load) MMD 67.7g
• Material Weather protected

Suspensions

• Stiffness KMS 5.92N/mm
• Compliance CMS 169µm/N
• Equivalent volume to the compliance VAS 157L
• Mechanical resistance RMS 3.12N·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) 2.9L
• Net weight 4.6kg