Pioneer Elite SP-EFS73 Dolby Atmos-enabled Andrew Jones Floorstanding Speaker (each) Pioneer Elite developed CST (Coherent Source Transducer) drivers; precise control on sound directivity at all frequencies True 3-Way Speaker design; each major frequency band is represented with a separate high-, midrange and low-frequency driver Dolby-enabled top-firing concentric driver Three 5-inch bass drivers for dynamic bass performance Gold Plated 5-Way Binding Posts; Multi-element complex crossover technology; 4 Ohm impedance