Celestion Truvox 0820

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93.7dB
• Frequency response 70 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 74.1Hz
• Mechanical quality factor QMS 6.30
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.39

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 114cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 0.543mH
• VC Diameter 50mm
• Winding height HVC 14mm
• Winding material Copper
• Former material Polyimide

Magnet

• Force factor Bl 11.5N/A
• Motor constant Bl/√RE 4.68N/√W
• Air gap height HAG 8mm
• Material Ferrite

Diaphragm

• Effective diameter 170mm
• Effective area SD 227cm²
• Moving mass MMS 19.5g
• Moving mass (without air load) MMD 17g
• Material Cellulose

Suspensions

• Stiffness KMS 4.17N/mm
• Compliance CMS 240µm/N
• Equivalent volume to the compliance VAS 17.3L
• Mechanical resistance RMS 1.5N·s/m
• Surround material Cloth-sealed

Dimensions

• Nominal diameter 8″
• 200mm
• Overall diameter 209mm
• Baffle cutout diameter 184mm
• Overall depth 94mm
• Volume occupied by the driver (estimated) 1L
• Net weight 3.0kg
• Frame material Pressed steel