Eighteen Sound 15ND930 16Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.2dB
• Frequency response 40 - 4100Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 9.50
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.39

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 16Ω
• DC resistance RE 10.9Ω
• Inductance (1kHz) LE 2.5mH
• VC Diameter 75mm

Magnet

• Force factor Bl 24.2N/A
• Motor constant Bl/√RE 7.33N/√W

Diaphragm

• Effective diameter 329mm
• Effective area SD 850cm²
• Moving mass MMS 92g
• Moving mass (without air load) MMD 74.7g

Suspensions

• Stiffness KMS 5.24N/mm
• Compliance CMS 191µm/N
• Equivalent volume to the compliance VAS 195L
• Mechanical resistance RMS 2.31N·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) 2.7L
• Net weight 4.0kg