Dayton Audio Ultimax UM15-22

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.7dB
• Frequency response 20 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 28.4Hz
• Mechanical quality factor QMS 2.80
• Electrical quality factor QES 0.95
• Total quality factor QTS 0.71

Large signal parameters

• Maximum linear excursion xmax 19mm
• Air volume displaced at xmax VD 1548cm³
• Power handling P 800W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 3.7Ω
• Inductance (1kHz, in series) LE 0.8mH
• VC Diameter 63.5mm
• Winding material Copper
• Former material Aluminum

Magnet

• Force factor (in series) Bl 14.1N/A
• Motor constant Bl/√RE 7.33N/√W
• Material Ferrite

Diaphragm

• Effective diameter 322mm
• Effective area SD 815cm²
• Moving mass MMS 287g
• Moving mass (without air load) MMD 270g
• Material Nomex

Suspensions

• Stiffness KMS 9.09N/mm
• Compliance CMS 110µm/N
• Equivalent volume to the compliance VAS 102L
• Mechanical resistance RMS 18.3N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 15″
• 388mm
• Overall diameter 388mm
• Baffle cutout diameter 351mm
• Overall depth 192mm
• Volume occupied by the driver (estimated) 4.8L
• Frame material Cast Aluminium