BMS 12N804

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93dB
• Frequency response 40 - 1700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 39Hz
• Mechanical quality factor QMS 4.60
• Electrical quality factor QES 0.31
• Total quality factor QTS 0.29

Large signal parameters

• Maximum linear excursion xmax 8mm
• Air volume displaced at xmax VD 425cm³
• Power handling P 1100W
• Program power Pmax 2200W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 0.66mH
• VC Diameter 101.6mm
• Winding height HVC 26mm
• Winding material Copper

Magnet

• Force factor Bl 20.4N/A
• Motor constant Bl/√RE 8.54N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 92g
• Moving mass (without air load) MMD 83.2g

Suspensions

• Stiffness KMS 5.56N/mm
• Compliance CMS 180µm/N
• Equivalent volume to the compliance VAS 71L
• Mechanical resistance RMS 4.9N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Overall depth 151mm
• Volume occupied by the driver (estimated) 2.5L
• Net weight 5.1kg
• Frame material Cast Aluminum