Dayton Audio ND105-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.1dB
• Frequency response 60 - 10000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 78.7Hz
• Mechanical quality factor QMS 7.42
• Electrical quality factor QES 0.66
• Total quality factor QTS 0.61

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 3.7Ω
• Inductance (1kHz) LE 0.76mH
• VC Diameter 25mm
• Winding material Copper
• Former material Kapton® / Polyimide

Magnet

• Force factor Bl 4.52N/A
• Motor constant Bl/√RE 2.35N/√W
• Material Neodymium

Diaphragm

• Effective diameter 81mm
• Effective area SD 51.5cm²
• Moving mass MMS 7.4g
• Moving mass (without air load) MMD 7.1g
• Material Black Anodized Aluminum

Suspensions

• Stiffness KMS 1.82N/mm
• Compliance CMS 550µm/N
• Equivalent volume to the compliance VAS 1.97L
• Mechanical resistance RMS 0.49N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 4″
• 105mm
• Overall diameter 105mm
• Baffle cutout diameter 93mm
• Overall depth 67mm
• Volume occupied by the driver (estimated) 0.2L
• Frame material Steel