The DRX-2.1 combines accurate, noise-free signal processing with high-current power for dynamic speaker control and the result is pure, rich and authentic sound. The DRX-2.1 includes DTS Play-Fi technology. DTS Play-Fi is the most widely adopted whole home audio technology in the marketplace- it puts in complete control of Music and allows you to effortlessly stream from smartphone, tablet, or PC to DTS Play-Fi speakers and devices throughout the home.