Dayton Audio Reference RS270P-4A

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.4dB
• Frequency response 23 - 6000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 22.9Hz
• Mechanical quality factor QMS 1.35
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 208cm³
• Power handling P 100W
• Program power Pmax 200W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.9Ω
• Inductance (1kHz) LE 0.55mH
• VC Diameter 50.8mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 10.9N/A
• Motor constant Bl/√RE 5.52N/√W
• Material Ferrite

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 73.2g
• Moving mass (without air load) MMD 68.3g
• Material Paper / Kevlar

Suspensions

• Stiffness KMS 1.52N/mm
• Compliance CMS 660µm/N
• Equivalent volume to the compliance VAS 111L
• Mechanical resistance RMS 7.8N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 10″
• 272mm
• Overall diameter 272mm
• Baffle cutout diameter 236mm
• Overall depth 113mm
• Volume occupied by the driver (estimated) 1.5L
• Frame material Cast Aluminium