Dayton Audio Classic DC130BS-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.7dB
• Frequency response 55 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 51.8Hz
• Mechanical quality factor QMS 1.86
• Electrical quality factor QES 0.44
• Total quality factor QTS 0.35

Large signal parameters

• Maximum linear excursion xmax 2.5mm
• Air volume displaced at xmax VD 23cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 0.5mH
• VC Diameter 25mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 4.8N/A
• Motor constant Bl/√RE 2.55N/√W
• Material Ferrite

Diaphragm

• Effective diameter 109mm
• Effective area SD 93.3cm²
• Moving mass MMS 8.8g
• Moving mass (without air load) MMD 8.1g
• Material Coated Paper

Suspensions

• Stiffness KMS 0.926N/mm
• Compliance CMS 1080µm/N
• Equivalent volume to the compliance VAS 13.2L
• Mechanical resistance RMS 1.54N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 5.25″
• 145mm
• Overall diameter 145mm
• Baffle cutout diameter 120mm
• Overall depth 77mm
• Volume occupied by the driver (estimated) 0.38L
• Frame material Steel