Dayton Audio Odeum Apollo 12LF

• Sensitivity (1W, 1m, infinite baffle) SPL1W 93dB
• Frequency response 30 - 1500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 28Hz
• Mechanical quality factor QMS 5.19
• Electrical quality factor QES 0.22
• Total quality factor QTS 0.21

Large signal parameters

• Maximum linear excursion xmax 9.3mm
• Air volume displaced at xmax VD 493cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.7Ω
• Inductance (1kHz) LE 1.47mH
• VC Diameter 76.2mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Force factor Bl 21.8N/A
• Motor constant Bl/√RE 8.42N/√W
• Material Ferrite

Diaphragm

• Effective diameter 261mm
• Effective area SD 533cm²
• Moving mass MMS 88.3g
• Moving mass (without air load) MMD 79.4g
• Material Treated Paper

Suspensions

• Stiffness KMS 2.7N/mm
• Compliance CMS 370µm/N
• Equivalent volume to the compliance VAS 148L
• Mechanical resistance RMS 2.99N·s/m
• Surround material Cloth

Dimensions

• Nominal diameter 12″
• 320mm
• Overall diameter 320mm
• Baffle cutout diameter 292mm
• Overall depth 152mm
• Volume occupied by the driver (estimated) 2.7L
• Frame material Cast Aluminium