Celestion TN1230

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.7dB
• Frequency response 50 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46.6Hz
• Mechanical quality factor QMS 4.76
• Electrical quality factor QES 0.37
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 3.8mm
• Air volume displaced at xmax VD 199cm³
• Power handling P 350W
• Program power Pmax 700W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 0.99mH
• VC Diameter 75mm
• Winding height HVC 17.5mm
• Winding material Round copper
• Former material Polyimide

Magnet

• Force factor Bl 18.6N/A
• Motor constant Bl/√RE 7.52N/√W
• Air gap height HAG 10mm
• Material Neodymium

Diaphragm

• Effective diameter 260mm
• Effective area SD 531cm²
• Moving mass MMS 72.4g
• Moving mass (without air load) MMD 63.8g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 64.3L
• Mechanical resistance RMS 4.45N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 309mm
• Baffle cutout diameter 283mm
• Overall depth 132mm
• Volume occupied by the driver (estimated) 1.3L
• Net weight 2.1kg
• Frame material Pressed steel