Dayton Audio Reference RS225P-8A

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.1dB
• Frequency response 30 - 7000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31.6Hz
• Mechanical quality factor QMS 1.25
• Electrical quality factor QES 0.46
• Total quality factor QTS 0.34

Large signal parameters

• Maximum linear excursion xmax 7mm
• Air volume displaced at xmax VD 150cm³
• Power handling P 80W
• Program power Pmax 120W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.1Ω
• Inductance (1kHz) LE 1.02mH
• VC Diameter 38.6mm

Magnet

• Force factor Bl 8.5N/A
• Motor constant Bl/√RE 3.19N/√W
• Material Ferrite

Diaphragm

• Effective diameter 165mm
• Effective area SD 214cm²
• Moving mass MMS 23.6g
• Moving mass (without air load) MMD 21.2g
• Material Paper / Kevlar

Suspensions

• Stiffness KMS 0.935N/mm
• Compliance CMS 1070µm/N
• Equivalent volume to the compliance VAS 68.8L
• Mechanical resistance RMS 3.75N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 223mm
• Overall diameter 223mm
• Baffle cutout diameter 184mm
• Overall depth 89mm
• Volume occupied by the driver (estimated) 0.82L
• Frame material Cast Aluminium