BMS 18N860

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.4dB
• Frequency response 20 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 24.9Hz
• Mechanical quality factor QMS 5.33
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 19mm
• Air volume displaced at xmax VD 2305cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 0.81mH
• VC Diameter 101.6mm
• Winding height HVC 50mm
• Winding material Copper

Magnet

• Force factor Bl 24.9N/A
• Motor constant Bl/√RE 10.4N/√W
• Air gap height HAG 12mm

Diaphragm

• Effective diameter 393mm
• Effective area SD 1213cm²
• Moving mass MMS 277g
• Moving mass (without air load) MMD 248g

Suspensions

• Stiffness KMS 6.76N/mm
• Compliance CMS 148µm/N
• Equivalent volume to the compliance VAS 304L
• Mechanical resistance RMS 8.11N·s/m

Dimensions

• Nominal diameter 18″
• 458mm
• Overall diameter 458mm
• Baffle cutout diameter 412mm
• Overall depth 250mm
• Volume occupied by the driver (estimated) 7L
• Net weight 10.5kg
• Frame material Aluminum