Eighteen Sound 21LW1400

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.9dB
• Frequency response 24 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 28Hz
• Mechanical quality factor QMS 9.32
• Electrical quality factor QES 0.24
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 9.5mm
• Air volume displaced at xmax VD 1577cm³
• Power handling P 1400W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 2.85mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 33.5N/A
• Motor constant Bl/√RE 15N/√W
• Material Ferrite

Diaphragm

• Effective diameter 460mm
• Effective area SD 1660cm²
• Moving mass MMS 296g
• Moving mass (without air load) MMD 249g
• Material Weather protected

Suspensions

• Stiffness KMS 9.17N/mm
• Compliance CMS 109µm/N
• Equivalent volume to the compliance VAS 385L
• Mechanical resistance RMS 5.59N·s/m

Dimensions

• Nominal diameter 21″
• 533mm
• Overall diameter 545mm
• Baffle cutout diameter 492mm
• Overall depth 259mm
• Flange thickness 14mm
• Mounting depth 245mm
• Volume occupied by the driver (estimated) 11L
• Net weight 17.0kg