BMS 12S330

• Sensitivity (1W, 1m, infinite baffle) SPL1W 90.6dB
• Frequency response 25 - 300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 28.6Hz
• Mechanical quality factor QMS 5.90
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 398cm³
• Power handling P 600W
• Program power Pmax 1200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 0.7mH
• VC Diameter 77mm
• Winding height HVC 26mm
• Winding material Copper

Magnet

• Force factor Bl 23N/A
• Motor constant Bl/√RE 9.39N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 252mm
• Effective area SD 498cm²
• Moving mass MMS 127g
• Moving mass (without air load) MMD 119g

Suspensions

• Stiffness KMS 4.17N/mm
• Compliance CMS 240µm/N
• Equivalent volume to the compliance VAS 85.5L
• Mechanical resistance RMS 3.87N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 284mm
• Overall depth 171mm
• Volume occupied by the driver (estimated) 4L
• Net weight 9.4kg
• Frame material Cast Aluminum