Celestion NTR10-2520D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.7dB
• Frequency response 55 - 3500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 57.2Hz
• Mechanical quality factor QMS 2.82
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.29

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 139cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.9Ω
• Inductance (1kHz) LE 0.49mH
• VC Diameter 64mm
• Winding height HVC 16mm
• Winding material Copper clad aluminium
• Former material Glass fibre

Magnet

• Force factor Bl 15.8N/A
• Motor constant Bl/√RE 6.51N/√W
• Air gap height HAG 8mm
• Material Neodymium

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 37.9g
• Moving mass (without air load) MMD 33.2g
• Material Kevlar loaded paper

Suspensions

• Stiffness KMS 5N/mm
• Compliance CMS 200µm/N
• Equivalent volume to the compliance VAS 34.7L
• Mechanical resistance RMS 4.82N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 10″
• 254mm
• Overall diameter 260mm
• Baffle cutout diameter 232mm
• Overall depth 113mm
• Volume occupied by the driver (estimated) 1.1L
• Net weight 2.2kg
• Frame material Cast aluminium