Dayton Audio Odeum Apollo 15N

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.9dB
• Frequency response 40 - 4500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 44Hz
• Mechanical quality factor QMS 10.47
• Electrical quality factor QES 0.34
• Total quality factor QTS 0.33

Large signal parameters

• Maximum linear excursion xmax 6.6mm
• Air volume displaced at xmax VD 553cm³
• Power handling P 500W
• Program power Pmax 1000W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.8Ω
• Inductance (1kHz) LE 0.14mH
• VC Diameter 76.2mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Force factor Bl 21N/A
• Motor constant Bl/√RE 8.7N/√W
• Material Neodymium

Diaphragm

• Effective diameter 328mm
• Effective area SD 845cm²
• Moving mass MMS 93.4g
• Moving mass (without air load) MMD 76.1g
• Material Coated Paper

Suspensions

• Stiffness KMS 7.04N/mm
• Compliance CMS 142µm/N
• Equivalent volume to the compliance VAS 155L
• Mechanical resistance RMS 2.47N·s/m
• Surround material Paper

Dimensions

• Nominal diameter 15″
• 389mm
• Overall diameter 389mm
• Baffle cutout diameter 353mm
• Overall depth 169mm
• Volume occupied by the driver (estimated) 4.1L
• Frame material Steel