Eighteen Sound 18LW2420

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.3dB
• Frequency response 30 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34Hz
• Mechanical quality factor QMS 6.90
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.31

Large signal parameters

• Maximum linear excursion xmax 10mm
• Air volume displaced at xmax VD 1225cm³
• Power handling P 1300W
• Program power Pmax 2600W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.8Ω
• Inductance (1kHz) LE 0.87mH
• VC Diameter 100mm

Magnet

• Force factor Bl 20.2N/A
• Motor constant Bl/√RE 12.1N/√W
• Material Ferrite

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 221g
• Moving mass (without air load) MMD 191g
• Material Weather protected

Suspensions

• Stiffness KMS 10.1N/mm
• Compliance CMS 99µm/N
• Equivalent volume to the compliance VAS 208L
• Mechanical resistance RMS 6.84N·s/m

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 422mm
• Overall depth 215mm
• Flange thickness 24mm
• Mounting depth 191mm
• Volume occupied by the driver (estimated) 7.1L
• Net weight 12.4kg