Dayton Audio Classic DCS305-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.8dB
• Frequency response 23 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 24.2Hz
• Mechanical quality factor QMS 5.07
• Electrical quality factor QES 0.43
• Total quality factor QTS 0.40

Large signal parameters

• Maximum linear excursion xmax 9.3mm
• Air volume displaced at xmax VD 464cm³
• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 2.06mH
• VC Diameter 65.5mm
• Winding material Copper
• Former material Kapton® / Polyimide

Magnet

• Force factor Bl 13.7N/A
• Motor constant Bl/√RE 7.54N/√W
• Material Ferrite

Diaphragm

• Effective diameter 252mm
• Effective area SD 499cm²
• Moving mass MMS 160g
• Moving mass (without air load) MMD 152g
• Material Paper / Kevlar

Suspensions

• Stiffness KMS 3.7N/mm
• Compliance CMS 270µm/N
• Equivalent volume to the compliance VAS 92.3L
• Mechanical resistance RMS 4.8N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 12″
• 306mm
• Overall diameter 306mm
• Baffle cutout diameter 275mm
• Overall depth 153mm
• Volume occupied by the driver (estimated) 2.6L
• Frame material Steel