Celestion TF1525e

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95.5dB
• Frequency response 45 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 47.5Hz
• Mechanical quality factor QMS 4.49
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.47

Large signal parameters

• Maximum linear excursion xmax 5.3mm
• Air volume displaced at xmax VD 449cm³
• Power handling P 300W
• Program power Pmax 600W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.8Ω
• Inductance (1kHz) LE 1.31mH
• VC Diameter 64mm
• Winding height HVC 14.5mm
• Winding material Edgewound copper
• Former material Glass fibre

Magnet

• Force factor Bl 17.8N/A
• Motor constant Bl/√RE 6.81N/√W
• Air gap height HAG 8mm
• Weight 1.4kg
• Material Ferrite

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 82.1g
• Moving mass (without air load) MMD 64.8g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 7.14N/mm
• Compliance CMS 140µm/N
• Equivalent volume to the compliance VAS 142L
• Mechanical resistance RMS 5.46N·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) 2.9L
• Net weight 4.8kg
• Frame material Pressed steel