Celestion BL15-300X (8)

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93dB
• Frequency response 42 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 48.1Hz
• Mechanical quality factor QMS 2.99
• Electrical quality factor QES 1.00
• Total quality factor QTS 0.75

Large signal parameters

• Maximum linear excursion xmax 4.3mm
• Air volume displaced at xmax VD 364cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.47mH
• VC Diameter 63.5mm
• Winding height HVC 16.5mm
• Winding material Copper
• Former material Polyimide

Magnet

• Force factor Bl 8.83N/A
• Motor constant Bl/√RE 4.98N/√W
• Air gap height HAG 8mm
• Height 46mm
• Material Ferrite

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 83.4g
• Moving mass (without air load) MMD 66.1g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 7.52N/mm
• Compliance CMS 133µm/N
• Equivalent volume to the compliance VAS 138L
• Mechanical resistance RMS 8.33N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 15″
• 381mm
• Overall diameter 385mm
• Baffle cutout diameter 351mm
• Overall depth 162mm
• Volume occupied by the driver (estimated) 2.9L
• Net weight 4.8kg