Eighteen Sound 12ND830

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.6dB
• Frequency response 53 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 58Hz
• Mechanical quality factor QMS 6.48
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Air volume displaced at xmax VD 345cm³
• Power handling P 450W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.8Ω
• Inductance (1kHz) LE 0.96mH
• VC Diameter 75mm

Magnet

• Force factor Bl 13.7N/A
• Motor constant Bl/√RE 8.19N/√W

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 47g
• Moving mass (without air load) MMD 38.2g

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 63L
• Mechanical resistance RMS 2.64N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 315mm
• Baffle cutout diameter 282mm
• Overall depth 140mm
• Flange thickness 9mm
• Mounting depth 131mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 4.3kg