R1855DB Bookshelf Speakers with Powerful Subwoofer Features: 10 degree angled sound design Jet Black MDF Enclosure Subwoofer output Treble, Bass, Volume control Wireless remote control Specifications: Input sensitivity Line in 1: 400±50mV; Line in 2: 600±50mV; Bluetooth: 500±50mFFs; Optical: 350±50mFFs; Coaxial: 350±50mFFs Power output R/L (treble): 16W+16W ; R/L (mid-bass driver): 19W+19W; Treble driver Ф19mm silk dome tweeter Frequency response R/L: 60Hz-20kHz Audio inputs Line in 1, Line in 2, Bluetooth Optical, Coaxial; Mid-range and bass speaker unit 116mm