R1380DB Professional Bookshelf Speakers Features: Wooden enclosure minimizes acoustic resonance Class-D amplifier with 42W RMS power output Bluetooth V5.1 connection Qualcomm aptX technology Specifications: Bluetooth version V5.1 Frequency response R/L: 55Hz-20kHz Audio inputs Line In, Optical, Coaxial, Bluetooth Total watts (RMS) R/L: 21W+21W