Eighteen Sound 18W1001

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.7dB
• Frequency response 37 - 4700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 7.10
• Electrical quality factor QES 0.24
• Total quality factor QTS 0.23

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 794cm³
• Power handling P 1000W
• Program power Pmax 1400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.8Ω
• Inductance (1kHz) LE 2.45mH
• VC Diameter 100mm
• Winding material Copper

Magnet

• Force factor Bl 27.6N/A
• Motor constant Bl/√RE 11.5N/√W
• Material Ferrite

Diaphragm

• Effective diameter 380mm
• Effective area SD 1134cm²
• Moving mass MMS 139g
• Moving mass (without air load) MMD 112g

Suspensions

• Stiffness KMS 6.71N/mm
• Compliance CMS 149µm/N
• Equivalent volume to the compliance VAS 268L
• Mechanical resistance RMS 4.31N·s/m
• Spider material Double Silicon

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 462mm
• Baffle cutout diameter 416mm
• Overall depth 205mm
• Flange thickness 19mm
• Mounting depth 186mm
• Volume occupied by the driver (estimated) 7.3L
• Net weight 13.6kg