Dayton Audio E220CF-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.9dB
• Frequency response 25 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 26.9Hz
• Mechanical quality factor QMS 7.14
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 108cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.1Ω
• Inductance (1kHz) LE 0.7mH
• VC Diameter 54mm
• Winding material Copper
• Former material Titanium

Magnet

• Force factor Bl 10N/A
• Motor constant Bl/√RE 4.05N/√W
• Material Neodymium

Diaphragm

• Effective diameter 166mm
• Effective area SD 216cm²
• Moving mass MMS 25.2g
• Moving mass (without air load) MMD 22.8g
• Material Carbon Fiber

Suspensions

• Stiffness KMS 0.719N/mm
• Compliance CMS 1390µm/N
• Equivalent volume to the compliance VAS 91.4L
• Mechanical resistance RMS 0.6N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 220mm
• Overall diameter 220mm
• Baffle cutout diameter 191mm
• Overall depth 115mm
• Volume occupied by the driver (estimated) 1.1L
• Frame material Cast Aluminium