Dayton Audio SD215A-88

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.8dB
• Frequency response 31 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 3.10
• Electrical quality factor QES 0.45
• Total quality factor QTS 0.39

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 125cm³
• Power handling P 80W
• Program power Pmax 160W

Voice Coil

• Nominal impedance Z 2 x 8Ω
• DC resistance (in series) RE 12.8Ω
• Inductance (1kHz, in series) LE 4.64mH
• VC Diameter 38.5mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor (in series) Bl 15.4N/A
• Motor constant Bl/√RE 4.3N/√W
• Material Ferrite

Diaphragm

• Effective diameter 163mm
• Effective area SD 209cm²
• Moving mass MMS 42.4g
• Moving mass (without air load) MMD 40.1g
• Material Coated Paper

Suspensions

• Stiffness KMS 1.61N/mm
• Compliance CMS 620µm/N
• Equivalent volume to the compliance VAS 38.2L
• Mechanical resistance RMS 2.66N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 216mm
• Overall diameter 216mm
• Baffle cutout diameter 180mm
• Overall depth 95mm
• Volume occupied by the driver (estimated) 0.86L
• Frame material Steel