Dayton Audio Reference RS75-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 82.8dB
• Frequency response 170 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 177Hz
• Mechanical quality factor QMS 5.76
• Electrical quality factor QES 0.97
• Total quality factor QTS 0.83

Large signal parameters

• Maximum linear excursion xmax 1.1mm
• Air volume displaced at xmax VD 1.3cm³
• Power handling P 15W
• Program power Pmax 30W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.72mH
• VC Diameter 16mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 2.01N/A
• Motor constant Bl/√RE 1.14N/√W
• Material Ferrite

Diaphragm

• Effective diameter 39mm
• Effective area SD 12cm²
• Moving mass MMS 1.1g
• Moving mass (without air load) MMD 1.1g
• Material Black Anodized Aluminum

Suspensions

• Stiffness KMS 1.39N/mm
• Compliance CMS 720µm/N
• Equivalent volume to the compliance VAS 0.14L
• Mechanical resistance RMS 0.21N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 3″
• 75mm
• Overall diameter 72mm
• Baffle cutout diameter 54mm
• Overall depth 39mm
• Frame material Cast Aluminium