ESX 6.5 Subwoofer Quantum QXE6D2 500w subwoofer Dual 2ohm January 27, 2024 admin QUANTUM QXE subwoofers impress with their very compact design. The slightly larger subs have a powerful 2 x 63 oz double magnet and just like the QXE6D2 a pole core drilling and also a ventilated T-Plate for optimal cooling.