Dayton Audio SD270A-88

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.5dB
• Frequency response 26 - 2000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 26.2Hz
• Mechanical quality factor QMS 3.23
• Electrical quality factor QES 0.50
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 208cm³
• Power handling P 80W
• Program power Pmax 160W

Voice Coil

• Nominal impedance Z 2 x 8Ω
• DC resistance (in series) RE 12.6Ω
• Inductance (1kHz, in series) LE 4.48mH
• VC Diameter 38.5mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor (in series) Bl 15.6N/A
• Motor constant Bl/√RE 4.39N/√W
• Material Ferrite

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 57.7g
• Moving mass (without air load) MMD 52.9g
• Material Coated Paper

Suspensions

• Stiffness KMS 1.56N/mm
• Compliance CMS 640µm/N
• Equivalent volume to the compliance VAS 108L
• Mechanical resistance RMS 2.94N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 10″
• 270mm
• Overall diameter 270mm
• Baffle cutout diameter 227mm
• Overall depth 109mm
• Volume occupied by the driver (estimated) 1.4L
• Frame material Steel