Dayton Audio Ultimax II UMII12-22

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.4dB
• Frequency response 22 - 400Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 31Hz
• Mechanical quality factor QMS 2.75
• Electrical quality factor QES 0.71
• Total quality factor QTS 0.56

Large signal parameters

• Maximum linear excursion xmax 22mm
• Air volume displaced at xmax VD 1162cm³
• Power handling P 800W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 2 x 2Ω
• DC resistance (in series) RE 4.2Ω
• Inductance (1kHz, in series) LE 0.66mH
• VC Diameter 76mm

Magnet

• Force factor (in series) Bl 14.8N/A
• Motor constant Bl/√RE 7.22N/√W
• Material Ferrite

Diaphragm

• Effective diameter 259mm
• Effective area SD 528cm²
• Moving mass MMS 189g
• Moving mass (without air load) MMD 181g
• Material Carbon Fiber

Suspensions

• Stiffness KMS 7.52N/mm
• Compliance CMS 133µm/N
• Equivalent volume to the compliance VAS 53L
• Mechanical resistance RMS 13.4N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 12″
• 285mm
• Overall diameter 285mm
• Baffle cutout diameter 200mm
• Overall depth 179mm
• Volume occupied by the driver (estimated) 2.9L
• Frame material Cast Aluminium