Dayton Audio Signature SIG180-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.4dB
• Frequency response 40 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 40.5Hz
• Mechanical quality factor QMS 5.19
• Electrical quality factor QES 0.41
• Total quality factor QTS 0.38

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 72cm³
• Power handling P 80W
• Program power Pmax 160W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.7Ω
• Inductance (1kHz) LE 0.47mH
• VC Diameter 31.8mm
• Winding material Copper
• Former material Glass fiber

Magnet

• Force factor Bl 6.6N/A
• Motor constant Bl/√RE 3.43N/√W
• Material Ferrite

Diaphragm

• Effective diameter 135mm
• Effective area SD 143cm²
• Moving mass MMS 19.2g
• Moving mass (without air load) MMD 17.9g
• Material Aluminum

Suspensions

• Stiffness KMS 1.24N/mm
• Compliance CMS 810µm/N
• Equivalent volume to the compliance VAS 23.2L
• Mechanical resistance RMS 0.94N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 6.5″
• 180mm
• Overall diameter 180mm
• Baffle cutout diameter 145mm
• Overall depth 81mm
• Volume occupied by the driver (estimated) 0.54L
• Frame material Cast Aluminium