Dayton Audio Odeum Apollo 18F

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.2dB
• Frequency response 30 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 32Hz
• Mechanical quality factor QMS 8.97
• Electrical quality factor QES 0.42
• Total quality factor QTS 0.40

Large signal parameters

• Maximum linear excursion xmax 10.6mm
• Air volume displaced at xmax VD 1272cm³
• Power handling P 1200W
• Program power Pmax 2400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.5Ω
• Inductance (1kHz) LE 2.25mH
• VC Diameter 101.6mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor Bl 24.4N/A
• Motor constant Bl/√RE 9.59N/√W
• Material Ferrite

Diaphragm

• Effective diameter 391mm
• Effective area SD 1200cm²
• Moving mass MMS 194g
• Moving mass (without air load) MMD 165g
• Material Coated Paper

Suspensions

• Stiffness KMS 7.69N/mm
• Compliance CMS 130µm/N
• Equivalent volume to the compliance VAS 288L
• Mechanical resistance RMS 4.34N·s/m
• Surround material Paper

Dimensions

• Nominal diameter 18″
• 462mm
• Overall diameter 462mm
• Baffle cutout diameter 414mm
• Overall depth 193mm
• Volume occupied by the driver (estimated) 6.1L
• Frame material Steel