Dayton Audio DMA90-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86dB
• Frequency response 85 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 88.2Hz
• Mechanical quality factor QMS 2.50
• Electrical quality factor QES 0.56
• Total quality factor QTS 0.45

Large signal parameters

• Maximum linear excursion xmax 2.5mm
• Air volume displaced at xmax VD 9.6cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.8Ω
• Inductance (1kHz) LE 0.3mH
• VC Diameter 25.4mm

Magnet

• Force factor Bl 3.5N/A
• Motor constant Bl/√RE 1.8N/√W

Diaphragm

• Effective diameter 70mm
• Effective area SD 38.5cm²
• Moving mass MMS 3.2g
• Moving mass (without air load) MMD 3g

Suspensions

• Stiffness KMS 0.971N/mm
• Compliance CMS 1030µm/N
• Equivalent volume to the compliance VAS 2.27L
• Mechanical resistance RMS 0.71N·s/m

Dimensions

• Nominal diameter 3.5″
• 89mm
• Volume occupied by the driver (estimated) 0.1L