Celestion CF1540F

Low frequency

Nominal diameter15″ / 381 mm
Resonance29.1 Hz
Q factor0.24
Sensitivity95 dB
Linear excursion± 8.6 mm
Program Power1200 W
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply

Specifications

  • Sensitivity (1W, 1m, infinite baffle) SPL1W 95dB
  • Frequency response 35 - 2000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 29.1Hz
  • Mechanical quality factor QMS 6.53
  • Electrical quality factor QES 0.24
  • Total quality factor QTS 0.24

Large signal parameters

  • Maximum linear excursion (one way) xmax 8.6mm
  • Air volume displaced at xmax VD 736cm³
  • Power handling P 600W
  • Program power Pmax 1200W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.5Ω
  • Inductance (1kHz) LE 1.74mH
  • VC Diameter 100mm
  • Winding height HVC 22mm
  • Winding material Round copper
  • Former material Glass Fibre

Magnet

  • Force factor Bl 23.2N/A
  • Motor constant Bl/√RE 9.84N/√W
  • Air gap height HAG 9.5mm
  • Weight 3.1kg
  • Material Ferrite

Diaphragm

  • Effective diameter 330mm
  • Effective area SD 855cm²
  • Moving mass MMS 129g
  • Moving mass (without air load) MMD 111g
  • Material Glass loaded cellulose

Suspensions

  • Stiffness KMS 4.31N/mm
  • Compliance CMS 232µm/N
  • Equivalent volume to the compliance VAS 228L
  • Mechanical resistance RMS 3.61N·s/m
  • Surround material Cloth-sealed

Dimensions

  • Nominal diameter 15
  • 381mm
  • Overall diameter 393mm
  • Baffle cutout diameter 355mm
  • Overall depth 182mm
  • Volume occupied by the driver (estimated) 4.9L
  • Net weight 9.62kg
  • Frame material Cast aluminium
Celestion CF1540F SPL & Impedance

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