Celestion FTR12-2565D

Mid Bass

Nominal diameter12″ / 305 mm
Resonance60.3 Hz
Q factor0.42
Sensitivity94.4 dB
Linear excursion± 4 mm
Program power500 W
Discontinued
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 94.4dB
  • Frequency response 55 - 4000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 60.3Hz
  • Mechanical quality factor QMS 2.40
  • Electrical quality factor QES 0.51
  • Total quality factor QTS 0.42

Large signal parameters

  • Maximum linear excursion (one way) xmax 4mm
  • Air volume displaced at xmax VD 212cm³
  • Power handling P 250W
  • Program power Pmax 500W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.6Ω
  • Inductance (1kHz) LE 1.02mH
  • VC Diameter 64mm
  • Winding height HVC 16.5mm
  • Winding material Round copper
  • Former material Glass fibre

Magnet

  • Force factor Bl 15.5N/A
  • Motor constant Bl/√RE 6.51N/√W
  • Air gap height HAG 8mm
  • Weight 1.5kg
  • Material Ferrite

Diaphragm

  • Effective diameter 260mm
  • Effective area SD 531cm²
  • Moving mass (including air load) MMS 56.6g
  • Moving mass MMD 47.7g
  • Material Kevlar loaded paper

Suspensions

  • Stiffness KMS 8.33N/mm
  • Compliance CMS 120µm/N
  • Equivalent volume to the compliance VAS 49.1L
  • Mechanical resistance RMS 8.91N·s/m
  • Surround material Cloth-sealed

Dimensions

  • Nominal diameter 12
  • 305mm
  • Overall diameter 318mm
  • Baffle cutout diameter 286mm
  • Overall depth 134mm
  • Volume occupied by the driver (estimated) 2.1L
  • Net weight 4.5kg
  • Frame material Cast aluminium
Celestion FTR12-2565D SPL & Impedance

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