Dayton Audio Ultimax II UMII15-22

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.4dB
• Frequency response 20 - 300Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 29Hz
• Mechanical quality factor QMS 2.34
• Electrical quality factor QES 1.00
• Total quality factor QTS 0.70

Large signal parameters

• Maximum linear excursion xmax 24mm
• Air volume displaced at xmax VD 1898cm³
• Power handling P 900W
• Program power Pmax 1800W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 4.2Ω
• Inductance (1kHz, in series) LE 0.7mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 14.6N/A
• Motor constant Bl/√RE 7.12N/√W
• Material Ferrite

Diaphragm

• Effective diameter 317mm
• Effective area SD 791cm²
• Moving mass MMS 279g
• Moving mass (without air load) MMD 264g
• Material Carbon Fiber

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 96L
• Mechanical resistance RMS 21.7N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 15″
• 353mm
• Overall diameter 353mm
• Baffle cutout diameter 200mm
• Overall depth 206mm
• Volume occupied by the driver (estimated) 4.6L
• Frame material Cast Aluminium