Dayton Audio Reference RS125P-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.7dB
• Frequency response 70 - 12000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 70Hz
• Mechanical quality factor QMS 3.19
• Electrical quality factor QES 0.57
• Total quality factor QTS 0.48

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 22cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.32mH
• VC Diameter 25mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 3.49N/A
• Motor constant Bl/√RE 1.98N/√W
• Material Ferrite

Diaphragm

• Effective diameter 83mm
• Effective area SD 54.1cm²
• Moving mass MMS 5.1g
• Moving mass (without air load) MMD 4.8g
• Material Paper / Kevlar

Suspensions

• Stiffness KMS 0.98N/mm
• Compliance CMS 1020µm/N
• Equivalent volume to the compliance VAS 3.98L
• Mechanical resistance RMS 0.7N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 5″
• 126mm
• Overall diameter 126mm
• Baffle cutout diameter 94mm
• Overall depth 55mm
• Volume occupied by the driver (estimated) 0.2L
• Frame material Cast Aluminium