Dayton Audio GF180-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.9dB
• Frequency response 45 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 49Hz
• Mechanical quality factor QMS 3.43
• Electrical quality factor QES 0.48
• Total quality factor QTS 0.42

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 52cm³
• Power handling P 40W
• Program power Pmax 80W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 4.4Ω
• Inductance (1kHz) LE 1.1mH
• VC Diameter 25.4mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 6.5N/A
• Motor constant Bl/√RE 3.1N/√W
• Material Ferrite

Diaphragm

• Effective diameter 129mm
• Effective area SD 130cm²
• Moving mass MMS 14.8g
• Moving mass (without air load) MMD 13.6g
• Material Fiberglass

Suspensions

• Stiffness KMS 1.43N/mm
• Compliance CMS 700µm/N
• Equivalent volume to the compliance VAS 16.5L
• Mechanical resistance RMS 1.33N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 6.5″
• 180mm
• Overall diameter 178mm
• Baffle cutout diameter 144mm
• Overall depth 81mm
• Volume occupied by the driver (estimated) 0.53L
• Frame material Steel