Dayton Audio Reference RS225-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.6dB
• Frequency response 35 - 2300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 2.02
• Electrical quality factor QES 0.52
• Total quality factor QTS 0.41

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 128cm³
• Power handling P 80W
• Program power Pmax 160W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz) LE 0.49mH
• VC Diameter 38mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 6.38N/A
• Motor constant Bl/√RE 3.57N/√W
• Material Ferrite

Diaphragm

• Effective diameter 165mm
• Effective area SD 214cm²
• Moving mass MMS 32.2g
• Moving mass (without air load) MMD 29.8g
• Material Black Anodized Aluminum

Suspensions

• Stiffness KMS 1.39N/mm
• Compliance CMS 720µm/N
• Equivalent volume to the compliance VAS 46.4L
• Mechanical resistance RMS 3.31N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 223mm
• Overall diameter 223mm
• Baffle cutout diameter 184mm
• Overall depth 92mm
• Volume occupied by the driver (estimated) 0.86L
• Frame material Cast Aluminium