Dayton Audio Signature SIG225-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88dB
• Frequency response 39 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 40Hz
• Mechanical quality factor QMS 8.87
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 133cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.9Ω
• Inductance (1kHz) LE 0.49mH
• VC Diameter 51mm
• Winding material Copper
• Former material Glass fiber

Magnet

• Force factor Bl 9N/A
• Motor constant Bl/√RE 4.56N/√W
• Material Ferrite

Diaphragm

• Effective diameter 168mm
• Effective area SD 221cm²
• Moving mass MMS 36.9g
• Moving mass (without air load) MMD 34.4g
• Material Aluminum

Suspensions

• Stiffness KMS 2.33N/mm
• Compliance CMS 430µm/N
• Equivalent volume to the compliance VAS 29.7L
• Mechanical resistance RMS 1.05N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 225mm
• Overall diameter 225mm
• Baffle cutout diameter 190mm
• Overall depth 102mm
• Volume occupied by the driver (estimated) 0.99L
• Frame material Cast Aluminium