Celestion TF1230

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.2dB
• Frequency response 45 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 59Hz
• Mechanical quality factor QMS 2.45
• Electrical quality factor QES 0.65
• Total quality factor QTS 0.52

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 266cm³
• Power handling P 350W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.2Ω
• Inductance (1kHz) LE 1.31mH
• VC Diameter 75mm
• Winding height HVC 17.5mm
• Winding material Round copper
• Former material Polyimide

Magnet

• Force factor Bl 13N/A
• Motor constant Bl/√RE 5.69N/√W
• Air gap height HAG 8mm
• Weight 1.4kg
• Material Ferrite

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 56.9g
• Moving mass (without air load) MMD 48.3g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 7.69N/mm
• Compliance CMS 130µm/N
• Equivalent volume to the compliance VAS 51.1L
• Mechanical resistance RMS 8.6N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 309mm
• Baffle cutout diameter 283mm
• Overall depth 140mm
• Volume occupied by the driver (estimated) 2.1L
• Net weight 4.3kg
• Frame material Pressed steel