Celestion TF1230SL

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.7dB
• Frequency response 50 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 56.8Hz
• Mechanical quality factor QMS 3.64
• Electrical quality factor QES 0.44
• Total quality factor QTS 0.39

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 319cm³
• Power handling P 350W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 0.89mH
• VC Diameter 75mm
• Winding height HVC 16mm
• Winding material Round copper
• Former material Polyimide

Magnet

• Force factor Bl 15.7N/A
• Motor constant Bl/√RE 6.9N/√W
• Air gap height HAG 8mm
• Weight 1.7kg
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 58.3g
• Moving mass (without air load) MMD 49.7g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 7.14N/mm
• Compliance CMS 140µm/N
• Equivalent volume to the compliance VAS 53.8L
• Mechanical resistance RMS 5.72N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 309mm
• Baffle cutout diameter 283mm
• Overall depth 137mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 4.3kg
• Frame material Pressed steel