Eighteen Sound 18LW1400

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96dB
• Frequency response 28 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 6.60
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 9mm
• Air volume displaced at xmax VD 1103cm³
• Power handling P 1000W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 1.5mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 22.1N/A
• Motor constant Bl/√RE 11.6N/√W

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 190g
• Moving mass (without air load) MMD 160g

Suspensions

• Stiffness KMS 8.2N/mm
• Compliance CMS 122µm/N
• Equivalent volume to the compliance VAS 210L
• Mechanical resistance RMS 5.97N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 215mm
• Flange thickness 26mm
• Mounting depth 189mm
• Volume occupied by the driver (estimated) 7.4L
• Net weight 13.3kg