B&C Speaker 18DS115

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95dB
• Frequency response 30 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 4.75
• Electrical quality factor QES 0.18
• Total quality factor QTS 0.17

Large signal parameters

• Maximum linear excursion xmax 16.5mm
• Air volume displaced at xmax VD 1997cm³
• Power handling P 1700W
• Program power Pmax 3400W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 2.8mH
• VC Diameter 116mm
• Winding height HVC 40mm
• Winding material Aluminium
• Former material Glass Fibre

Magnet

• Flux density B 0.8T
• Force factor Bl 34N/A
• Motor constant Bl/√RE 18.7N/√W
• Air gap height HAG 14mm
• Material Neodymium Inside Slug

Diaphragm

• Effective diameter 393mm
• Effective area SD 1210cm²
• Moving mass MMS 348g
• Moving mass (without air load) MMD 319g
• Material Waterproof Both Sides

Suspensions

• Stiffness KMS 11.9N/mm
• Compliance CMS 84µm/N
• Equivalent volume to the compliance VAS 177L
• Mechanical resistance RMS 13.8N·s/m
• Spider material Silicone

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 460mm
• Baffle cutout diameter 422mm
• Overall depth 248mm
• Flange thickness 16mm
• Mounting depth 232mm
• Volume occupied by the driver 10L
• Net weight 12.55kg