BMS 12S320

• Sensitivity (1W, 1m, infinite baffle) SPL1W 96.6dB
• Frequency response 45 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 45.4Hz
• Mechanical quality factor QMS 4.20
• Electrical quality factor QES 0.21
• Total quality factor QTS 0.20

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 239cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 0.75mH
• VC Diameter 77mm
• Winding height HVC 19mm
• Winding material Copper

Magnet

• Force factor Bl 23.3N/A
• Motor constant Bl/√RE 9.76N/√W
• Air gap height HAG 10mm
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 69g
• Moving mass (without air load) MMD 60.2g

Suspensions

• Stiffness KMS 5.68N/mm
• Compliance CMS 176µm/N
• Equivalent volume to the compliance VAS 69.5L
• Mechanical resistance RMS 4.69N·s/m

Dimensions

• Nominal diameter 12″
• 318mm
• Overall diameter 318mm
• Baffle cutout diameter 284mm
• Overall depth 149mm
• Volume occupied by the driver (estimated) 3.3L
• Net weight 8.1kg
• Frame material Cast Aluminum