BMS 15N840

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 22 - 300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35.6Hz
• Mechanical quality factor QMS 5.75
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.30

Large signal parameters

• Maximum linear excursion xmax 11mm
• Air volume displaced at xmax VD 930cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 0.82mH
• VC Diameter 101.6mm
• Winding height HVC 32mm
• Winding material Copper

Magnet

• Force factor Bl 24.6N/A
• Motor constant Bl/√RE 11N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 330mm
• Effective area SD 845cm²
• Moving mass MMS 137g
• Moving mass (without air load) MMD 120g

Suspensions

• Stiffness KMS 6.85N/mm
• Compliance CMS 146µm/N
• Equivalent volume to the compliance VAS 146L
• Mechanical resistance RMS 5.33N·s/m

Dimensions

• Nominal diameter 15″
• 388mm
• Overall diameter 388mm
• Baffle cutout diameter 358mm
• Overall depth 194mm
• Volume occupied by the driver (estimated) 4L
• Net weight 6.8kg
• Frame material Cast Aluminum