B&C Speaker 18RBX100 4Ω

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.5dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 42Hz
• Mechanical quality factor QMS 8.00
• Electrical quality factor QES 0.41
• Total quality factor QTS 0.40

Large signal parameters

• Maximum linear excursion xmax 10mm
• Air volume displaced at xmax VD 1225cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.5Ω
• Inductance (1kHz) LE 1.2mH
• VC Diameter 100mm
• Winding height HVC 25mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.1T
• Force factor Bl 22N/A
• Motor constant Bl/√RE 11.8N/√W
• Air gap height HAG 11mm
• Material Ferrite

Diaphragm

• Effective diameter 395mm
• Effective area SD 1225cm²
• Moving mass MMS 210g
• Moving mass (without air load) MMD 180g
• Material Waterproof

Suspensions

• Stiffness KMS 15.6N/mm
• Compliance CMS 64µm/N
• Equivalent volume to the compliance VAS 136L
• Mechanical resistance RMS 6.93N·s/m
• Spider material Double Silicone

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 460mm
• Baffle cutout diameter 422mm
• Overall depth 200mm
• Flange thickness 14mm
• Mounting depth 186mm
• Volume occupied by the driver 10.5L
• Net weight 12.3kg