BMS 15N820

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.1dB
• Frequency response 40 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 39.2Hz
• Mechanical quality factor QMS 4.50
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 396cm³
• Power handling P 900W
• Program power Pmax 1800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.7Ω
• Inductance (1kHz) LE 0.81mH
• VC Diameter 101.6mm
• Winding height HVC 19mm
• Winding material Copper

Magnet

• Force factor Bl 24.2N/A
• Motor constant Bl/√RE 10.1N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 335mm
• Effective area SD 880cm²
• Moving mass MMS 114g
• Moving mass (without air load) MMD 96g

Suspensions

• Stiffness KMS 6.94N/mm
• Compliance CMS 144µm/N
• Equivalent volume to the compliance VAS 159L
• Mechanical resistance RMS 6.24N·s/m

Dimensions

• Nominal diameter 15″
• 388mm
• Overall diameter 388mm
• Baffle cutout diameter 358mm
• Overall depth 184mm
• Volume occupied by the driver (estimated) 3.5L
• Net weight 5.7kg
• Frame material Cast Aluminum