Bellatrix is a 2.5-way, 3-speaker system. The woofer and mid-woofer work in a joined volume constituted by a multi-chamber bass-reflex / TQWT system with ventilation at the bottom side. The multilayer enclosure is designed in the CRCdesign technology, internally reinforced with a grating made of plywood and steel. A separate chamber for the tweeter has been designed. Mineral mats were used to dampen the enclosure precisely, so it was unnecessary to use other loose dampening materials. Bellatrix stands on a one-piece carbon steel pedestal integrated with the enclosure, equipped with our Kepler vibrations absorbing feet.