Dayton Audio DMA105-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.1dB
• Frequency response 70 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 72.7Hz
• Mechanical quality factor QMS 2.60
• Electrical quality factor QES 0.63
• Total quality factor QTS 0.51

Large signal parameters

• Maximum linear excursion xmax 2.5mm
• Air volume displaced at xmax VD 14cm³
• Power handling P 35W
• Program power Pmax 70W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz) LE 0.3mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 3.4N/A
• Motor constant Bl/√RE 1.84N/√W

Diaphragm

• Effective diameter 83mm
• Effective area SD 54.1cm²
• Moving mass MMS 4.5g
• Moving mass (without air load) MMD 4.2g

Suspensions

• Stiffness KMS 0.943N/mm
• Compliance CMS 1060µm/N
• Equivalent volume to the compliance VAS 4.25L
• Mechanical resistance RMS 0.79N·s/m

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.14L