Celestion BN15-400X

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.7dB
• Frequency response 38 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35.1Hz
• Mechanical quality factor QMS 5.07
• Electrical quality factor QES 0.59
• Total quality factor QTS 0.53

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 342cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.08mH
• VC Diameter 76.2mm
• Winding height HVC 18mm
• Winding material Copper
• Former material Polyimide

Magnet

• Force factor Bl 12.9N/A
• Motor constant Bl/√RE 5.66N/√W
• Air gap height HAG 10mm
• Height 40mm
• Material Neodymium

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 84g
• Moving mass (without air load) MMD 66.7g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 4.1N/mm
• Compliance CMS 244µm/N
• Equivalent volume to the compliance VAS 253L
• Mechanical resistance RMS 3.66N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 15″
• 381mm
• Overall diameter 385mm
• Baffle cutout diameter 351mm
• Overall depth 152mm
• Volume occupied by the driver (estimated) 1.8L
• Net weight 2.6kg