ESX Quantum QE1224

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.1dB

Thiele & Small parameters

• Resonance frequency (free air) fS 37Hz
• Mechanical quality factor QMS 3.66
• Electrical quality factor QES 0.50
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 13.3mm
• Maximum excursion before damage xlim 20mm
• Air volume displaced at xmax VD 676cm³
• Power handling P 800W
• Program power Pmax 1600W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 7.2Ω
• Inductance (1kHz, in series) LE 2.7mH
• VC Diameter 76mm
• Winding height HVC 34.5mm

Magnet

• Force factor (in series) Bl 20.5N/A
• Motor constant Bl/√RE 7.64N/√W

Diaphragm

• Effective diameter 255mm
• Effective area SD 510cm²
• Moving mass MMS 125g
• Moving mass (without air load) MMD 117g

Suspensions

• Stiffness KMS 6.85N/mm
• Compliance CMS 146µm/N
• Equivalent volume to the compliance VAS 54L
• Mechanical resistance RMS 7.94N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 323mm
• Baffle cutout diameter 288mm
• Mounting depth 160mm
• Volume occupied by the driver (estimated) 2.8L