Dayton Audio PM180-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.6dB
• Frequency response 55 - 12000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 53.2Hz
• Mechanical quality factor QMS 4.13
• Electrical quality factor QES 0.30
• Total quality factor QTS 0.28

Large signal parameters

• Maximum linear excursion xmax 4.6mm
• Air volume displaced at xmax VD 60cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.4Ω
• Inductance (1kHz) LE 0.68mH
• VC Diameter 25mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 7.7N/A
• Motor constant Bl/√RE 3.04N/√W
• Material Neodymium

Diaphragm

• Effective diameter 129mm
• Effective area SD 131cm²
• Moving mass MMS 8.2g
• Moving mass (without air load) MMD 7g
• Material Paper

Suspensions

• Stiffness KMS 0.909N/mm
• Compliance CMS 1100µm/N
• Equivalent volume to the compliance VAS 28L
• Mechanical resistance RMS 0.66N·s/m
• Surround material Cloth

Dimensions

• Nominal diameter 6.5″
• 180mm
• Overall diameter 180mm
• Baffle cutout diameter 145mm
• Overall depth 78mm
• Volume occupied by the driver (estimated) 0.51L
• Frame material Cast Aluminium