Dayton Audio ND64-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 81.8dB
• Frequency response 100 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 103Hz
• Mechanical quality factor QMS 4.36
• Electrical quality factor QES 0.36
• Total quality factor QTS 0.33

Large signal parameters

• Maximum linear excursion xmax 1.9mm
• Air volume displaced at xmax VD 3cm³
• Power handling P 15W
• Program power Pmax 30W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.7Ω
• Inductance (1kHz) LE 0.37mH
• VC Diameter 19mm
• Winding material CCA
• Former material Polyimide

Magnet

• Force factor Bl 4.13N/A
• Motor constant Bl/√RE 2.15N/√W
• Material Neodymium

Diaphragm

• Effective diameter 45mm
• Effective area SD 15.6cm²
• Moving mass MMS 2.56g
• Moving mass (without air load) MMD 2.5g
• Material Black Anodized Aluminum

Suspensions

• Stiffness KMS 1.08N/mm
• Compliance CMS 930µm/N
• Equivalent volume to the compliance VAS 0.42L
• Mechanical resistance RMS 0.38N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 2.5″
• 64mm
• Overall diameter 64mm
• Baffle cutout diameter 53mm
• Overall depth 39mm
• Frame material Stamped Steel