BMS 12S305

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.6dB
• Frequency response 35 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 5.80
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 11mm
• Air volume displaced at xmax VD 567cm³
• Power handling P 800W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.4Ω
• Inductance (1kHz) LE 0.7mH
• VC Diameter 77mm
• Winding height HVC 32mm
• Winding material Copper

Magnet

• Force factor Bl 20.1N/A
• Motor constant Bl/√RE 8.67N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 256mm
• Effective area SD 515cm²
• Moving mass MMS 95g
• Moving mass (without air load) MMD 86.5g

Suspensions

• Stiffness KMS 4.59N/mm
• Compliance CMS 218µm/N
• Equivalent volume to the compliance VAS 82L
• Mechanical resistance RMS 3.6N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 284mm
• Overall depth 153mm
• Volume occupied by the driver (estimated) 3.4L
• Net weight 8.0kg
• Frame material Cast Aluminum