BMS 12N620

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.8dB
• Frequency response 45 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 44.7Hz
• Mechanical quality factor QMS 5.10
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 5.5mm
• Air volume displaced at xmax VD 292cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 0.6mH
• VC Diameter 77mm
• Winding height HVC 19mm
• Winding material Copper

Magnet

• Force factor Bl 20.6N/A
• Motor constant Bl/√RE 8.63N/√W
• Air gap height HAG 8mm
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 68g
• Moving mass (without air load) MMD 59.2g

Suspensions

• Stiffness KMS 5.56N/mm
• Compliance CMS 180µm/N
• Equivalent volume to the compliance VAS 72.7L
• Mechanical resistance RMS 3.74N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 284mm
• Overall depth 145mm
• Volume occupied by the driver (estimated) 1.9L
• Net weight 3.5kg
• Frame material Cast Aluminum