Celestion TF1230S

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.6dB
• Frequency response 50 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 60.3Hz
• Mechanical quality factor QMS 3.28
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 4.5mm
• Air volume displaced at xmax VD 239cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.0Ω
• Inductance (1kHz) LE 0.98mH
• VC Diameter 75mm
• Winding height HVC 17mm
• Winding material Edgewound copper clad aluminium
• Former material Polyimide

Magnet

• Force factor Bl 16.6N/A
• Motor constant Bl/√RE 6.77N/√W
• Air gap height HAG 8mm
• Weight 1.7kg
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 51.1g
• Moving mass (without air load) MMD 42.3g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 7.14N/mm
• Compliance CMS 140µm/N
• Equivalent volume to the compliance VAS 54.4L
• Mechanical resistance RMS 5.91N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 318mm
• Baffle cutout diameter 283mm
• Overall depth 137mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 4.3kg
• Frame material Pressed steel