Eighteen Sound 15ND830 8Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.3dB
• Frequency response 38 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 39Hz
• Mechanical quality factor QMS 3.90
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.32

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 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 1.54mH
• VC Diameter 75mm
• Winding material Aluminum

Magnet

• Force factor Bl 18N/A
• Motor constant Bl/√RE 7.54N/√W
• Material Neodymium

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 80g
• Moving mass (without air load) MMD 62.7g
• Material Weather protected

Suspensions

• Stiffness KMS 4.81N/mm
• Compliance CMS 208µm/N
• Equivalent volume to the compliance VAS 213L
• Mechanical resistance RMS 5.03N·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