Celestion TF1530

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.1dB
• Frequency response 40 - 3000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 42Hz
• Mechanical quality factor QMS 2.73
• Electrical quality factor QES 0.31
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 342cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.8Ω
• Inductance (1kHz) LE 0.96mH
• VC Diameter 75mm
• Winding height HVC 12mm
• Winding material Round copper
• Former material Polyimide

Magnet

• Force factor Bl 21.2N/A
• Motor constant Bl/√RE 8.8N/√W
• Air gap height HAG 8mm
• Weight 2.44kg
• Material Ferrite

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 91.7g
• Moving mass (without air load) MMD 74.3g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 162L
• Mechanical resistance RMS 8.87N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 15″
• 381mm
• Overall diameter 385mm
• Baffle cutout diameter 352mm
• Overall depth 163mm
• Volume occupied by the driver (estimated) 3.6L
• Net weight 6.9kg
• Frame material Pressed steel