Eighteen Sound 18LW1251

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.9dB
• Frequency response 35 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 8.00
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 9mm
• Air volume displaced at xmax VD 1021cm³
• Power handling P 1000W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 2.73mH
• VC Diameter 100mm

Magnet

• Force factor Bl 23.6N/A
• Motor constant Bl/√RE 10.6N/√W
• Material Ferrite

Diaphragm

• Effective diameter 380mm
• Effective area SD 1134cm²
• Moving mass MMS 142g
• Moving mass (without air load) MMD 115g
• Material Weather protected

Suspensions

• Stiffness KMS 6.85N/mm
• Compliance CMS 146µm/N
• Equivalent volume to the compliance VAS 268L
• Mechanical resistance RMS 3.9N·s/m
• Spider material Double Silicon

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 207mm
• Flange thickness 19mm
• Mounting depth 188mm
• Volume occupied by the driver (estimated) 7.1L
• Net weight 13.0kg