BMS 18S430v²

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 20 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 6.00
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 970cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 4.8Ω
• Inductance (1kHz) LE 0.82mH
• VC Diameter 101.6mm
• Winding height HVC 26mm
• Winding material Copper

Magnet

• Force factor Bl 23.5N/A
• Motor constant Bl/√RE 10.7N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 393mm
• Effective area SD 1213cm²
• Moving mass MMS 210g
• Moving mass (without air load) MMD 181g

Suspensions

• Stiffness KMS 8N/mm
• Compliance CMS 125µm/N
• Equivalent volume to the compliance VAS 262L
• Mechanical resistance RMS 6.82N·s/m

Dimensions

• Nominal diameter 18″
• 458mm
• Overall diameter 458mm
• Baffle cutout diameter 414mm
• Overall depth 218mm
• Volume occupied by the driver (estimated) 7.3L
• Net weight 12.8kg
• Frame material Cast Aluminum