Celestion NTR08-2011D

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.2dB
• Frequency response 70 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 84.8Hz
• Mechanical quality factor QMS 2.34
• Electrical quality factor QES 0.54
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 136cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.8Ω
• Inductance (1kHz) LE 0.59mH
• VC Diameter 50mm
• Winding height HVC 16mm
• Winding material Round copper
• Former material Polyimide

Magnet

• Force factor Bl 12N/A
• Motor constant Bl/√RE 4.98N/√W
• Air gap height HAG 8mm
• Material Neodymium

Diaphragm

• Effective diameter 170mm
• Effective area SD 227cm²
• Moving mass MMS 24.9g
• Moving mass (without air load) MMD 22.3g
• Material Kevlar loaded paper (weather-resistant)

Suspensions

• Stiffness KMS 7.14N/mm
• Compliance CMS 140µm/N
• Equivalent volume to the compliance VAS 10.3L
• Mechanical resistance RMS 5.66N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 8″
• 203mm
• Overall diameter 225mm
• Baffle cutout diameter 100mm
• Overall depth 100mm
• Volume occupied by the driver (estimated) 0.7L
• Net weight 1.5kg
• Frame material Cast aluminium