ESX Quantum QE1222

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.9dB

Thiele & Small parameters

• Resonance frequency (free air) fS 33Hz
• Mechanical quality factor QMS 4.80
• Electrical quality factor QES 0.41
• Total quality factor QTS 0.38

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 2Ω
• DC resistance (in series) RE 4.0Ω
• Inductance (1kHz, in series) LE 2.2mH
• VC Diameter 76mm
• Winding height HVC 34.5mm

Magnet

• Force factor (in series) Bl 17.1N/A
• Motor constant Bl/√RE 8.55N/√W

Diaphragm

• Effective diameter 255mm
• Effective area SD 510cm²
• Moving mass MMS 144g
• Moving mass (without air load) MMD 136g

Suspensions

• Stiffness KMS 6.25N/mm
• Compliance CMS 160µm/N
• Equivalent volume to the compliance VAS 59L
• Mechanical resistance RMS 6.22N·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