BMS 12N803

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 40 - 1700Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 41Hz
• Mechanical quality factor QMS 5.20
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 319cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 0.61mH
• VC Diameter 101.6mm
• Winding height HVC 22mm
• Winding material Copper

Magnet

• Force factor Bl 21.4N/A
• Motor constant Bl/√RE 8.94N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 78g
• Moving mass (without air load) MMD 69.2g

Suspensions

• Stiffness KMS 5.18N/mm
• Compliance CMS 193µm/N
• Equivalent volume to the compliance VAS 77L
• Mechanical resistance RMS 3.86N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Overall depth 147mm
• Volume occupied by the driver (estimated) 2.3L
• Net weight 4.7kg
• Frame material Cast Aluminum