B&C Speaker 18SW115

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94dB
• Frequency response 35 - 1500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 34Hz
• Mechanical quality factor QMS 6.10
• Electrical quality factor QES 0.31
• Total quality factor QTS 0.30

Large signal parameters

• Maximum linear excursion xmax 14mm
• Air volume displaced at xmax VD 1694cm³
• Power handling P 1700W
• Program power Pmax 3400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 1.36mH
• VC Diameter 116mm
• Winding height HVC 34mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.16T
• Force factor Bl 26N/A
• Motor constant Bl/√RE 14.3N/√W
• Air gap height HAG 14mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 393mm
• Effective area SD 1210cm²
• Moving mass MMS 304g
• Moving mass (without air load) MMD 275g
• Material Waterproof Both Sides

Suspensions

• Stiffness KMS 13.5N/mm
• Compliance CMS 74µm/N
• Equivalent volume to the compliance VAS 149L
• Mechanical resistance RMS 10.7N·s/m
• Spider material Silicone

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 460mm
• Baffle cutout diameter 422mm
• Overall depth 242mm
• Flange thickness 16mm
• Mounting depth 226mm
• Volume occupied by the driver 10.5L
• Net weight 11.9kg