Dayton Audio PC68-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83.3dB
• Frequency response 120 - 17000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 117Hz
• Mechanical quality factor QMS 2.49
• Electrical quality factor QES 0.87
• Total quality factor QTS 0.65

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 4.2cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.8Ω
• Inductance (1kHz) LE 0.29mH
• VC Diameter 19mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 2.4N/A
• Motor constant Bl/√RE 1.23N/√W
• Material Ferrite

Diaphragm

• Effective diameter 52mm
• Effective area SD 21.2cm²
• Moving mass MMS 1.7g
• Moving mass (without air load) MMD 1.6g
• Material Poly Composite

Suspensions

• Stiffness KMS 0.935N/mm
• Compliance CMS 1070µm/N
• Equivalent volume to the compliance VAS 0.7L
• Mechanical resistance RMS 0.5N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 2.5″
• 68mm
• Overall diameter 68mm
• Baffle cutout diameter 64mm
• Overall depth 37mm
• Frame material Stamped Steel