Dayton Audio Classic DCS205-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.5dB
• Frequency response 30 - 200Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32.3Hz
• Mechanical quality factor QMS 6.28
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 8.8mm
• Air volume displaced at xmax VD 188cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.9Ω
• Inductance (1kHz) LE 1.78mH
• VC Diameter 38.5mm
• Winding material Copper
• Former material Kapton® / Polyimide

Magnet

• Force factor Bl 10.7N/A
• Motor constant Bl/√RE 5.42N/√W
• Weight 0.936kg
• Material Ferrite

Diaphragm

• Effective diameter 165mm
• Effective area SD 214cm²
• Moving mass MMS 57.7g
• Moving mass (without air load) MMD 55.4g
• Material Paper / Kevlar

Suspensions

• Stiffness KMS 2.38N/mm
• Compliance CMS 420µm/N
• Equivalent volume to the compliance VAS 27L
• Mechanical resistance RMS 1.86N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 208mm
• Overall diameter 208mm
• Baffle cutout diameter 180mm
• Overall depth 108mm
• Volume occupied by the driver (estimated) 0.97L
• Frame material Steel