Dayton Audio DMA70-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 83dB
• Frequency response 110 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 113Hz
• Mechanical quality factor QMS 2.04
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 4.6cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 4.0Ω
• Inductance (1kHz) LE 0.3mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 3.7N/A
• Motor constant Bl/√RE 1.85N/√W

Diaphragm

• Effective diameter 54mm
• Effective area SD 22.9cm²
• Moving mass MMS 2.8g
• Moving mass (without air load) MMD 2.7g

Suspensions

• Stiffness KMS 1.41N/mm
• Compliance CMS 710µm/N
• Equivalent volume to the compliance VAS 0.566L
• Mechanical resistance RMS 0.97N·s/m

Dimensions

• Nominal diameter 2.5″
• 64mm