Dayton Audio PC105-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.4dB
• Frequency response 80 - 15000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 81.4Hz
• Mechanical quality factor QMS 2.17
• Electrical quality factor QES 0.67
• Total quality factor QTS 0.51

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 11cm³
• Power handling P 40W
• Program power Pmax 80W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.32mH
• VC Diameter 25.4mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 3.3N/A
• Motor constant Bl/√RE 1.82N/√W
• Material Ferrite

Diaphragm

• Effective diameter 82mm
• Effective area SD 52.8cm²
• Moving mass MMS 4.2g
• Moving mass (without air load) MMD 3.9g
• Material Poly Composite

Suspensions

• Stiffness KMS 1.09N/mm
• Compliance CMS 920µm/N
• Equivalent volume to the compliance VAS 3.68L
• Mechanical resistance RMS 0.99N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 107mm
• Overall diameter 107mm
• Baffle cutout diameter 60mm
• Overall depth 102mm
• Volume occupied by the driver (estimated) 0.37L
• Frame material Stamped Steel