Dayton Audio Odeum Apollo 12N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 40 - 5600Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 38Hz
• Mechanical quality factor QMS 7.75
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 6.8mm
• Air volume displaced at xmax VD 334cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 7.5Ω
• Inductance (1kHz) LE 1.21mH
• VC Diameter 76.2mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Force factor Bl 19.2N/A
• Motor constant Bl/√RE 7.01N/√W
• Material Neodymium

Diaphragm

• Effective diameter 251mm
• Effective area SD 495cm²
• Moving mass MMS 54.5g
• Moving mass (without air load) MMD 46.3g
• Material Coated Paper

Suspensions

• Stiffness KMS 3.1N/mm
• Compliance CMS 323µm/N
• Equivalent volume to the compliance VAS 128L
• Mechanical resistance RMS 1.68N·s/m
• Surround material Paper

Dimensions

• Nominal diameter 12″
• 320mm
• Overall diameter 320mm
• Baffle cutout diameter 292mm
• Overall depth 144mm
• Volume occupied by the driver (estimated) 2.5L
• Frame material Steel