BMS 18N850v²

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.3dB
• Frequency response 20 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 29.8Hz
• Mechanical quality factor QMS 7.00
• Electrical quality factor QES 0.35
• Total quality factor QTS 0.33

Large signal parameters

• Maximum linear excursion xmax 12mm
• Air volume displaced at xmax VD 1456cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 0.85mH
• VC Diameter 101.6mm
• Winding height HVC 36mm
• Winding material Copper

Magnet

• Force factor Bl 25.4N/A
• Motor constant Bl/√RE 11.4N/√W
• Air gap height HAG 12mm
• Material Neodymium

Diaphragm

• Effective diameter 393mm
• Effective area SD 1213cm²
• Moving mass MMS 240g
• Moving mass (without air load) MMD 211g

Suspensions

• Stiffness KMS 8.33N/mm
• Compliance CMS 120µm/N
• Equivalent volume to the compliance VAS 243L
• Mechanical resistance RMS 6.42N·s/m

Dimensions

• Nominal diameter 18″
• 458mm
• Overall diameter 458mm
• Baffle cutout diameter 414mm
• Overall depth 237mm
• Volume occupied by the driver (estimated) 6.5L
• Net weight 9.8kg
• Frame material Cast Aluminum