Dayton Audio Reference RS125-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.1dB
• Frequency response 65 - 5400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 57.2Hz
• Mechanical quality factor QMS 2.04
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 21cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 2.9Ω
• Inductance (1kHz) LE 0.28mH
• VC Diameter 25mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 3.63N/A
• Motor constant Bl/√RE 2.13N/√W
• Material Ferrite

Diaphragm

• Effective diameter 82mm
• Effective area SD 52.8cm²
• Moving mass MMS 5.7g
• Moving mass (without air load) MMD 5.4g
• Material Black Anodized Aluminum

Suspensions

• Stiffness KMS 0.741N/mm
• Compliance CMS 1350µm/N
• Equivalent volume to the compliance VAS 5.29L
• Mechanical resistance RMS 1N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 5″
• 126mm
• Overall diameter 126mm
• Baffle cutout diameter 94mm
• Overall depth 54mm
• Volume occupied by the driver (estimated) 0.2L
• Frame material Cast Aluminium